\u5728\u51fd\u6570\u5185\u90e8\u58f0\u660e\u7684\u53d8\u91cf\u53ea\u80fd\u5728\u51fd\u6570\u5185\u90e8\u88ab\u8bbf\u95ee\uff0c\u5916\u90e8\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee\u3002<\/p>\n\n\n\n
1. \u51fd\u6570\u5185\u90e8\u58f0\u660e\u7684\u53d8\u91cf\uff0c\u5728\u51fd\u6570\u5916\u90e8\u65e0\u6cd5\u88ab\u8bbf\u95ee
2. \u51fd\u6570\u7684\u53c2\u6570\u4e5f\u662f\u51fd\u6570\u5185\u90e8\u7684\u5c40\u90e8\u53d8\u91cf
3. \u4e0d\u540c\u51fd\u6570\u5185\u90e8\u58f0\u660e\u7684\u53d8\u91cf\u65e0\u6cd5\u4e92\u76f8\u8bbf\u95ee
4. \u51fd\u6570\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u51fd\u6570\u5185\u90e8\u7684\u53d8\u91cf\u5b9e\u9645\u88ab\u6e05\u7a7a\u4e86<\/p>\n\n\n\n
2. \u5757\u4f5c\u7528\u57df\uff1a<\/strong><\/h3>\n\n\n\n\u5728JavaScript\u4e2d\u4f7f\u7528{ }\u5305\u88f9\u7684\u4ee3\u7801\u79f0\u4e3a\u4ee3\u7801\u5757\uff0c\u4ee3\u7801\u5757\u5185\u90e8\u58f0\u660e\u7684\u53d8\u91cf\u5916\u90e8\u5c06 \u6709\u53ef\u80fd \u65e0\u6cd5\u88ab\u8bbf\u95ee\u3002<\/p>\n\n\n\n
1. let \u58f0\u660e\u7684\u53d8\u91cf\u4f1a\u4ea7\u751f\u5757\u4f5c\u7528\u57df\uff0cvar \u4e0d\u4f1a\u4ea7\u751f\u5757\u4f5c\u7528\u57df
2. const \u58f0\u660e\u7684\u5e38\u91cf\u4e5f\u4f1a\u4ea7\u751f\u5757\u4f5c\u7528\u57df
3. \u4e0d\u540c\u4ee3\u7801\u5757\u4e4b\u95f4\u7684\u53d8\u91cf\u65e0\u6cd5\u4e92\u76f8\u8bbf\u95ee
4. \u63a8\u8350\u4f7f\u7528 let \u6216 const<\/p>\n\n\n\n
1.2 \u5168\u5c40\u4f5c\u7528\u57df<\/h2>\n\n\n\n
<script> \u6807\u7b7e \u548c .js \u6587\u4ef6 \u7684\u3010\u6700\u5916\u5c42\u3011\u5c31\u662f\u5168\u5c40\u4f5c\u7528\u57df\uff0c\u5728\u6b64\u58f0\u660e\u7684\u53d8\u91cf\u5728\u51fd\u6570\u5185\u90e8\u4e5f\u53ef\u4ee5\u88ab\u8bbf\u95ee\u3002 \u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\uff0c\u4efb\u4f55\u5176\u5b83\u4f5c\u7528\u57df\u90fd\u53ef\u4ee5\u88ab\u8bbf\u95ee\u3002
\u6ce8\u610f\uff1a
1. \u4e3a window \u5bf9\u8c61\u52a8\u6001\u6dfb\u52a0\u7684\u5c5e\u6027\u9ed8\u8ba4\u4e5f\u662f\u5168\u5c40\u7684\uff0c\u4e0d\u63a8\u8350\uff01
2. \u51fd\u6570\u4e2d\u672a\u4f7f\u7528\u4efb\u4f55\u5173\u952e\u5b57\u58f0\u660e\u7684\u53d8\u91cf\u4e3a\u5168\u5c40\u53d8\u91cf\uff0c\u4e0d\u63a8\u8350\uff01\uff01\uff01
3. \u5c3d\u53ef\u80fd\u5c11\u7684\u58f0\u660e\u5168\u5c40\u53d8\u91cf\uff0c\u9632\u6b62\u5168\u5c40\u53d8\u91cf\u88ab\u6c61\u67d3
JavaScript \u4e2d\u7684\u4f5c\u7528\u57df\u662f\u7a0b\u5e8f\u88ab\u6267\u884c\u65f6\u7684\u5e95\u5c42\u673a\u5236\uff0c\u4e86\u89e3\u8fd9\u4e00\u673a\u5236\u6709\u52a9\u4e8e\u89c4\u8303\u4ee3\u7801\u4e66\u5199\u4e60\u60ef\uff0c\u907f\u514d\u56e0\u4f5c\u7528\u57df\u5bfc\u81f4\u7684\u8bed\u6cd5\u9519\u8bef\u3002<\/p>\n\n\n\n
1.3 \u4f5c\u7528\u57df\u94fe<\/h2>\n\n\n\n
\u4f5c\u7528\u57df\u94fe\u672c\u8d28\u4e0a\u662f\u5e95\u5c42\u7684 \u53d8\u91cf\u67e5\u627e\u673a\u5236 \u3002
\u5728\u51fd\u6570\u88ab\u6267\u884c\u65f6\uff0c\u4f1a \u4f18\u5148\u67e5\u627e\u5f53\u524d \u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u67e5\u627e\u53d8\u91cf\u3002\u5982\u679c\u5f53\u524d\u4f5c\u7528\u57df\u67e5\u627e\u4e0d\u5230\u5219\u4f1a\u4f9d\u6b21 \u9010\u7ea7\u67e5\u627e\u7236\u7ea7\u4f5c\u7528\u57df \u76f4\u5230\u5168\u5c40\u4f5c\u7528\u57df\u3002<\/p>\n\n\n\n
1. \u5d4c\u5957\u5173\u7cfb\u7684\u4f5c\u7528\u57df\u4e32\u8054\u8d77\u6765\u5f62\u6210\u4e86\u4f5c\u7528\u57df\u94fe
2. \u76f8\u540c\u4f5c\u7528\u57df\u94fe\u4e2d\u6309\u7740 \u4ece\u5c0f\u5230\u5927 \u7684\u89c4\u5219\u67e5\u627e\u53d8\u91cf
3. \u5b50\u4f5c\u7528\u57df\u80fd\u591f\u8bbf\u95ee\u7236\u4f5c\u7528\u57df\uff0c\u7236\u7ea7\u4f5c\u7528\u57df\u65e0\u6cd5\u8bbf\u95ee\u5b50\u7ea7\u4f5c\u7528\u57df<\/p>\n\n\n\n
\u5783\u573e\u56de\u6536\u673a\u5236<\/h1>\n\n\n\n
2.\u5185\u5b58\u7684\u751f\u547d\u5468\u671f
JS\u73af\u5883\u4e2d\u5206\u914d\u7684\u5185\u5b58, \u4e00\u822c\u6709\u5982\u4e0b\u751f\u547d\u5468\u671f\uff1a
1. \u5185\u5b58\u5206\u914d \uff1a\u5f53\u6211\u4eec\u58f0\u660e\u53d8\u91cf\u3001\u51fd\u6570\u3001\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u4e3a\u4ed6\u4eec\u5206\u914d\u5185\u5b58
2. \u5185\u5b58\u4f7f\u7528 \uff1a\u5373\u8bfb\u5199\u5185\u5b58\uff0c\u4e5f\u5c31\u662f\u4f7f\u7528\u53d8\u91cf\u3001\u51fd\u6570\u7b49
3. \u5185\u5b58\u56de\u6536 \uff1a\u4f7f\u7528\u5b8c\u6bd5\uff0c\u7531\u5783\u573e\u56de\u6536\u81ea\u52a8\u56de\u6536\u4e0d\u518d\u4f7f\u7528\u7684\u5185\u5b58
\u8bf4\u660e\uff1a\u5168\u5c40\u53d8\u91cf\u4e00\u822c\u4e0d\u4f1a\u56de\u6536(\u5173\u95ed\u9875\u9762\u56de\u6536)\uff1b \u4e00\u822c\u60c5\u51b5\u4e0b\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u4e0d\u7528\u4e86, \u4f1a\u88ab\u81ea\u52a8\u56de\u6536
\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p>\n\n\n\n
\u4f46\u5982\u679c\u4e0d\u4e86\u89e3JS\u7684\u5185\u5b58\u7ba1\u7406\u673a\u5236\uff0c\u6211\u4eec\u540c\u6837\u975e\u5e38\u5bb9\u6613\u6210\u5185\u5b58\u6cc4\u6f0f\uff08\u5185\u5b58\u65e0\u6cd5\u88ab\u56de\u6536\uff09\u7684\u60c5\u51b5\u3002
\u4e0d\u518d\u7528\u5230\u7684\u5185\u5b58\uff0c\u6ca1\u6709\u53ca\u65f6\u91ca\u653e\uff0c \u5c31\u53eb\u505a \u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n\n\n\n
\u548cc\/cpp\u76f8\u540c\uff0c\u6808\u548c\u5806<\/p>\n\n\n\n
\u6d45\u62f7\u8d1d\u548c\u6df1\u62f7\u8d1d<\/p>\n\n\n\n
\u5f15\u7528\u8ba1\u6570<\/h4>\n\n\n\n\u6807\u8bb0\u6e05\u9664<\/h4>\n\n\n\n\u95ed\u5305closure<\/h3>\n\n\n\n
\u6982\u5ff5\uff1a\u4e00\u4e2a\u51fd\u6570\u5bf9\u5468\u56f4\u72b6\u6001\u7684\u5f15\u7528\u6346\u7ed1\u5728\u4e00\u8d77\uff0c\u5185\u5c42\u51fd\u6570\u4e2d\u8bbf\u95ee\u5230\u5176\u5916\u5c42\u51fd\u6570\u7684\u4f5c\u7528\u57df
\u7b80\u5355\u7406\u89e3\uff1a \u95ed\u5305 = \u5185\u5c42\u51fd\u6570 + \u5916\u5c42\u51fd\u6570\u7684\u53d8\u91cf
\u95ed\u5305\u4f5c\u7528\uff1a \u5c01\u95ed\u6570\u636e\uff0c\u63d0\u4f9b\u64cd\u4f5c\uff0c\u5916\u90e8\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u51fd\u6570\u5185\u90e8\u7684\u53d8\u91cf<\/p>\n\n\n\n
\/\/ \u7b80\u5355\u7684\u5199\u6cd5\n function outer() {\n let a = 10\n function fn() {\n console.log(a)\n }\n fn()\n }\n outer()===fn===function fn(){}<\/code><\/pre>\n\n\n\n![](\"blob:https:\/\/eve2333.top\/5e976b0f-e5aa-43e9-b326-354a98924ec8\")
\u200b![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729837952-\u5c4f\u5e55\u622a\u56fe-2024-10-25-143220.png\")
<\/p>\n\n\n\n
\u662f\u5916\u90e8\u9700\u8981\u8c03\u7528\u5185\u90e8\u7684\u51fd\u6570\uff0c\u800c\u4e0d\u662f\u83b7\u53d6\u8fd9\u4e2a\u51fd\u6570\u7684\u503c<\/p>\n\n\n\n
\u5b9e\u73b0\u6570\u636e\u7684\u79c1\u6709\uff0c\u975e\u5e38\u597d\u95ed\u5305\uff0cclass private:<\/p>\n\n\n\n
\u5185\u5b58\u6cc4\u6f0f\u7684\u53ef\u80fd<\/p>\n\n\n\n
\u53d8\u91cf\u63d0\u5347<\/h3>\n\n\n\n
\u53d8\u91cf\u63d0\u5347\u662f JavaScript \u4e2d\u6bd4\u8f83\u201c\u5947\u602a\u201d\u7684\u73b0\u8c61\uff0c\u5b83\u5141\u8bb8\u5728\u53d8\u91cf\u58f0\u660e\u4e4b\u524d\u5373\u88ab\u8bbf\u95ee\uff08\u4ec5\u5b58\u5728\u4e8e var \u58f0\u660e\u53d8\u91cf\uff09
\u6ce8\u610f\uff1a
1. \u53d8\u91cf\u5728\u672a\u58f0\u660e\u5373\u88ab\u8bbf\u95ee\u65f6\u4f1a\u62a5\u8bed\u6cd5\u9519\u8bef
2. \u53d8\u91cf\u5728var\u58f0\u660e\u4e4b\u524d\u5373\u88ab\u8bbf\u95ee\uff0c\u53d8\u91cf\u7684\u503c\u4e3a undefined
3. let\/const \u58f0\u660e\u7684\u53d8\u91cf\u4e0d\u5b58\u5728\u53d8\u91cf\u63d0\u5347
4. \u53d8\u91cf\u63d0\u5347\u51fa\u73b0\u5728\u76f8\u540c\u4f5c\u7528\u57df\u5f53\u4e2d
5. \u5b9e\u9645\u5f00\u53d1\u4e2d\u63a8\u8350\u5148\u58f0\u660e\u518d\u8bbf\u95ee\u53d8\u91cf
\u8bf4\u660e\uff1a
JS\u521d\u5b66\u8005\u7ecf\u5e38\u82b1\u5f88\u591a\u65f6\u95f4\u624d\u80fd\u4e60\u60ef\u53d8\u91cf\u63d0\u5347\uff0c\u8fd8\u7ecf\u5e38\u51fa\u73b0\u4e00\u4e9b\u610f\u60f3\u4e0d\u5230\u7684bug\uff0c\u6b63\u56e0\u4e3a\u5982\u6b64\uff0cES6 \u5f15\u5165\u4e86\u5757\u7ea7\u4f5c\u7528\u57df\uff0c\u7528let \u6216\u8005 const\u58f0\u660e\u53d8\u91cf\uff0c\u8ba9\u4ee3\u7801\u5199\u6cd5\u66f4\u52a0\u89c4\u8303\u548c\u4eba\u6027\u5316\u3002
\u53d8\u91cf\u63d0\u5347\u7684\u6d41\u7a0b\uff1a
1. \u5148\u628avar \u53d8\u91cf\u63d0\u5347\u5230\u5f53\u524d\u4f5c\u7528\u57df\u4e8e\u6700\u524d\u9762
2. \u53ea\u63d0\u5347\u53d8\u91cf\u58f0\u660e\uff0c \u4e0d\u63d0\u5347\u53d8\u91cf\u8d4b\u503c
3. \u7136\u540e\u4f9d\u6b21\u6267\u884c\u4ee3\u7801
\u4e0d\u5efa\u8bae\u4f7f\u7528var\u58f0\u660e<\/p>\n\n\n\n
![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729837975-\u5c4f\u5e55\u622a\u56fe-2024-10-25-143247.png\")
<\/p>\n\n\n\n
underfinedworld\uff01<\/p>\n\n\n\n
\u51fd\u6570\u8fdb\u9636<\/h1>\n\n\n\n
\u51fd\u6570\u63d0\u5347\u4e0e\u53d8\u91cf\u63d0\u5347\u6bd4\u8f83\u7c7b\u4f3c\uff0c\u662f\u6307\u51fd\u6570\u5728\u58f0\u660e\u4e4b\u524d\u5373\u53ef\u88ab\u8c03\u7528\u3002![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838062-\u5c4f\u5e55\u622a\u56fe-2024-10-25-143415.png\")
<\/p>\n\n\n\n
\u52a8\u6001\u53c2\u6570 <\/h3>\n\n\n\n <script>\n function getSum() {\n \/\/ arguments \u52a8\u6001\u53c2\u6570 \u53ea\u5b58\u5728\u4e8e \u51fd\u6570\u91cc\u9762\n \/\/ \u662f\u4f2a\u6570\u7ec4 \u91cc\u9762\u5b58\u50a8\u7684\u662f\u4f20\u9012\u8fc7\u6765\u7684\u5b9e\u53c2\n \/\/ console.log(arguments) [2,3,4][1, 2, 3, 4, 2, 2, 3, 4]\n let sum = 0\n for (let i = 0; i < arguments.length; i++) {\n sum += arguments[i]\n }\n console.log(sum)\n }\n getSum(2, 3, 4)\n getSum(1, 2, 3, 4, 2, 2, 3, 4)\n <\/script><\/code><\/pre>\n\n\n\n1. arguments \u662f\u4e00\u4e2a \u4f2a\u6570\u7ec4 \uff0c\u53ea\u5b58\u5728\u4e8e\u51fd\u6570\u4e2d
2. arguments \u7684\u4f5c\u7528\u662f \u52a8\u6001\u83b7\u53d6\u51fd\u6570\u7684\u5b9e\u53c2<\/p>\n\n\n\n
\u5269\u4f59\u53c2\u6570<\/h2>\n\n\n\n
\u5269\u4f59\u53c2\u6570\u5141\u8bb8\u6211\u4eec\u5c06\u4e00\u4e2a\u4e0d\u5b9a\u6570\u91cf\u7684\u53c2\u6570\u8868\u793a\u4e3a\u4e00\u4e2a\u6570\u7ec4<\/p>\n\n\n\n
\u5269\u4f59\u53c2\u6570\u4e3b\u8981\u7684\u4f7f\u7528\u573a\u666f<\/strong>\uff1a \u7528\u4e8e\u83b7\u53d6\u591a\u4f59\u7684\u5b9e\u53c2<\/p>\n\n\n\n <script>\n function getSum(...arr) {\n console.log(arr) \/\/ \u4f7f\u7528\u7684\u65f6\u5019\u4e0d\u9700\u8981\u5199 ...\n }\n getSum(2, 3) \/\/ [2\uff0c3]\n getSum(1, 2, 3, 4, 5) \/\/ [1\uff0c2\uff0c3,4,5]\n <\/script><\/code><\/pre>\n\n\n\n <script>\n function getSum(a, b, ...arr) {\n console.log(arr) \/\/ \u4f7f\u7528\u7684\u65f6\u5019\u4e0d\u9700\u8981\u5199 ...\n }\n getSum(2, 3) \/\/ []\n getSum(1, 2, 3, 4, 5) \/\/ [3,4,5]\n <\/script><\/code><\/pre>\n\n\n\n1. ... \u662f\u8bed\u6cd5\u7b26\u53f7\uff0c\u7f6e\u4e8e\u6700\u672b\u51fd\u6570\u5f62\u53c2\u4e4b\u524d\uff0c\u7528\u4e8e\u83b7\u53d6 \u591a\u4f59 \u7684\u5b9e\u53c2
2. \u501f\u52a9 ... \u83b7\u53d6\u7684\u5269\u4f59\u5b9e\u53c2\uff0c\u662f\u4e2a \u771f\u6570\u7ec4
\u5269\u4f59\u53c2\u6570\u548c\u52a8\u6001\u53c2\u6570\u533a\u522b\uff1a \u52a8\u6001\u53c2\u6570\u662f\u4f2a\u6570\u7ec4\uff0c\u5269\u4f59\u53c2\u6570\u662f\u771f\u6570\u7ec4
\u5f00\u53d1\u4e2d\uff0c\u8fd8\u662f\u63d0\u5021\u591a\u4f7f\u7528 \u5269\u4f59\u53c2\u6570<\/strong><\/p>\n\n\n\n\u5c55\u5f00\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n
\u5c55\u5f00\u8fd0\u7b97\u7b26(\u2026)\uff0c\u5c06\u4e00\u4e2a\u6570\u7ec4\u8fdb\u884c\u5c55\u5f00\uff0c\u4e0d\u4f1a\u4fee\u6539\u539f\u6570\u7ec4<\/p>\n\n\n\n
\u5178\u578b\u8fd0\u7528\u573a\u666f\uff1a <\/strong>\u6c42\u6570\u7ec4\u6700\u5927\u503c(\u6700\u5c0f\u503c)\u3001\u5408\u5e76\u6570\u7ec4\u7b49<\/p>\n\n\n\n\u5bf9\u4e8e\u6c42\u6700\u5927\u503c\uff0c\u6709Math.max\uff08\uff09\u8fd9\u4e00\u65b9\u6cd5\uff0c\u4f46\u662f\u53ea\u662f\u7528\u4e8estring\u6c42max\uff0c\u5bf9\u4e8e\u6570\u7ec4\u65e0\u6cd5\u8bc6\u522b\uff0c\u56e0\u6b64\u7528\u5c55\u5f00\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
const arr=[1,2,1,5,1,1,2,6,5,9]\nconsole.log(...arr)\nconsole.log(Math.max(...arr))\/\/9\n\nconsole.log(Math.min(...arr))\/\/1<\/code><\/pre>\n\n\n\nlog\u62ec\u53f7\u5185\u53ef\u4ee5\u6253\u5370\u591a\u4e2a\u53c2\u6570\uff0c\u7528\u9017\u53f7\u9694\u5f00\uff0c\u6253\u5370\u7ed3\u679c\u5c31\u662f\u591a\u4e2a\u53c2\u6570\u662f\u5728\u63a7\u5236\u53f0\u7528\u7a7a\u683c\u9694\u5f00 <\/p>\n\n\n\n
\u5bf9\u4e8e\u5408\u5e76\u6570\u7ec4\uff0c<\/p>\n\n\n\n
const arr1=[1,2,3]\nconst arr2 = [4, 5]\n const arr = [...arr1, ...arr2]\n console.log(arr) \/\/ [1,2,3,4,5]<\/code><\/pre>\n\n\n\n\u7bad\u5934\u51fd\u6570<\/h2>\n\n\n\n
\u5f15\u5165\u7bad\u5934\u51fd\u6570\u7684\u76ee\u7684\u662f\u66f4\u7b80\u77ed\u7684\u51fd\u6570\u548c\u4e0d\u7528this\uff0c\u66f4\u5b9e\u7528\u4e8e\u9700\u8981\u533f\u540d\u51fd\u6570\u7684\u5730\u65b9<\/p>\n\n\n\n
\u57fa\u672c\u8bed\u6cd5\nconst fn=()=>{\n console.log(123)\n}\nfn()\n\/\/123\n\n\nconst fn=(x)=>{\n console.log(x)\n}\nfn(1)<\/code><\/pre>\n\n\n\n\u53ea\u6709\u4e00\u4e2a\u5f62\u53c2\u53ef\u4ee5\u7701\u7565\u5c0f\u62ec\u53f7\nconst fn= x =>{\n console.log(x)\n}\nfn(1)\n\n\u53ea\u8981\u4e00\u884c\u4ee3\u7801\u53ef\u4ee5\u7701\u7565\u5927\u62ec\u53f7\nconst fn = x => console.log(x)\nfn(1)\n\n\u53ea\u6709\u4e00\u884c\u4ee3\u7801\u53ef\u4ee5\u7701\u7565return\nconst fn=x=>x+x\nconsole.log(fn(1))\n\nconst fn=(x,y)=>x+y\nconsole.log(fn(1,2))\n\n\u52a0\u62ec\u53f7\u7684\u51fd\u6570\u4f53\u8fd4\u56de\u5bf9\u8c61\u5b57\u9762\u91cf\uff0c\u52a0\uff1a\nconst fn =(uname)=>({name:uname})\nconsole.log(fn('kobe'))\n\u76f4\u63a5\u8fd4\u56de\u5bf9\u8c61<\/code><\/pre>\n\n\n\n\u7bad\u5934\u51fd\u6570\u5c5e\u4e8e\u8868\u8fbe\u5f0f\u51fd\u6570\uff0c\u56e0\u6b64\u4e0d\u5b58\u5728\u51fd\u6570\u63d0\u5347 <\/p>\n\n\n\n
1. \u666e\u901a\u51fd\u6570\u6709arguments \u52a8\u6001\u53c2\u6570
2. \u7bad\u5934\u51fd\u6570 \u6ca1\u6709 arguments \u52a8\u6001\u53c2\u6570\uff0c\u4f46\u662f \u6709\u5269\u4f59\u53c2\u6570 ..args<\/p>\n\n\n\n
<script>\n \/\/ 1. \u5229\u7528\u7bad\u5934\u51fd\u6570\u6765\u6c42\u548c\n const getSum = (...arr) => {\n let sum = 0\n for (let i = 0; i < arr.length; i++) {\n sum += arr[i]\n }\n return sum\n }\n const result = getSum(2, 3, 4)\n console.log(result) \/\/ 9\n <\/script><\/code><\/pre>\n\n\n\nthis\u6307\u5411\u95ee\u9898<\/h4>\n\n\n\n <script>\n \/\/ \u4ee5\u524dthis\u7684\u6307\u5411\uff1a \u8c01\u8c03\u7528\u7684\u8fd9\u4e2a\u51fd\u6570\uff0cthis \u5c31\u6307\u5411\u8c01\n \/\/ console.log(this) \/\/ window\n \/\/ \/\/ \u666e\u901a\u51fd\u6570\n \/\/ function fn() {\n \/\/ console.log(this) \/\/ window\n \/\/ }\n \/\/ window.fn()\n \/\/ \/\/ \u5bf9\u8c61\u65b9\u6cd5\u91cc\u9762\u7684this\n \/\/ const obj = {\n \/\/ name: 'andy',\n \/\/ sayHi: function () {\n \/\/ console.log(this) \/\/ obj\n \/\/ }\n \/\/ }\n \/\/ obj.sayHi()\n \n \/\/ 2. \u7bad\u5934\u51fd\u6570\u7684this \u662f\u4e0a\u4e00\u5c42\u4f5c\u7528\u57df\u7684this \u6307\u5411\n \/\/ const fn = () => {\n \/\/ console.log(this) \/\/ window\n \/\/ }\n \/\/ fn()\n \/\/ \u5bf9\u8c61\u65b9\u6cd5\u7bad\u5934\u51fd\u6570 this\n\n \/\/ const obj = {\n \/\/ uname: 'pink\u8001\u5e08',\n \/\/ sayHi: () => {\n \/\/ console.log(this) \/\/ this \u6307\u5411\u8c01\uff1f window\n\/\/\u56e0\u4e3a\u7bad\u5934\u51fd\u6570\u6ca1\u6709this \u662f\u4ece\u5f53\u524d\u4f5c\u7528\u57df\u7684\u4e0a\u4e00\u5c42\u4f5c\u7528\u57dfthis \u7684\u6307\u5411 sayHi\u7684\u4e0a\u4e00\u5c42\u662fobj \n\/\/obj\u7684\u8c01\u8c03\u7528 this\u5c31\u6307\u5411\u8c01 \u662fwindow\u8c03\u7528 \u6240\u4ee5\u662fwindow\n \/\/ }\n \/\/ }\n \/\/ obj.sayHi()\n \n const obj = {\n uname: 'pink\u8001\u5e08',\n sayHi: function () {\n console.log(this) \/\/ obj\n let i = 10\n const count = () => {\n console.log(this) \/\/ obj \n }\n count()\n }\n }\n obj.sayHi()\n \u5b9e\u5728\u770b\u4e0d\u51fa\u7bad\u5934\u51fd\u6570\u5185\u7684this\u6307\u5411\u8c01\uff0c\u5c31\u628a\u5b83\u6362\u6210\u666e\u901a\u51fd\u6570\u8bd5\u4e00\u4e0b\uff0c\n\u627e\u5230\u666e\u901a\u51fd\u6570\u7684this\u540e\u518d\u5f80\u4e0a\u627e\u4e00\u7ea7\u5c31\u597d\u4e86\n <\/script><\/code><\/pre>\n\n\n\n\u7bad\u5934\u51fd\u6570\u4e0d\u4f1a\u521b\u5efa\u81ea\u5df1\u7684this\uff0c\u4ed6\u53ea\u4f1a\u4ece\u81ea\u5df1\u7684\u4f5c\u7528\u57df\u94fe\u4e0a\u4e00\u7ea7\u6cbf\u7528this<\/p>\n\n\n\n
\u5728\u5f00\u53d1\u4e2d\u4f7f\u7528\u7bad\u5934\u51fd\u6570\u8981\u8003\u8651\u51fd\u6570\u7684this\u7684\u503c\uff0c\u4e8b\u4ef6\u56de\u8c03\u51fd\u6570\u4f7f\u7528\u7bad\u5934\u51fd\u6570\uff0cthis\u662f\u5168\u5c40\u7684window\uff0c\u56e0\u6b64DOM\u56de\u8c03\u51fd\u6570\u4e3a\u4e86\u7b80\u4fbf\uff0c\u4e0d\u662f\u5f88\u63a8\u8350\u7bad\u5934\u51fd\u6570<\/p>\n\n\n\n
\u89e3\u6784\u8d4b\u503c<\/h2>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838109-\u5c4f\u5e55\u622a\u56fe-2024-10-25-143455.png\")
<\/figure>\n\n\n\n \u6570\u7ec4\u89e3\u6784<\/h3>\n\n\n\n
\u5c06\u6570\u7ec4\u7684\u5355\u5143\u503c\u5feb\u901f\u6279\u91cf\u8d4b\u503c\u7ed9\u4e00\u7cfb\u5217\u53d8\u91cf\u7684\u7b80\u4ecb\u8bed\u6cd5<\/p>\n\n\n\n
const arr=[100,60,80]\nconst [max,min,avg]=[100,60,80]<\/code><\/pre>\n\n\n\n\u4ea4\u6362\u53d8\u91cf\nlet a=1\nlet b=2;\n\n[b,a]=[a,b]![](\"blob:https:\/\/eve2333.top\/8f7f75f6-3ece-4959-ae6b-42cf48706bef\")
<\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838137-\u5c4f\u5e55\u622a\u56fe-2024-10-25-143527.png\")
<\/figure>\n\n\n\n1.\u7acb\u5373\u6267\u884c\u51fd\u6570\u8981\u52a0\n (function ( })() \/\/(function ( })() \n\n2\u3001\u4f7f\u7528\u6570\u7ec4\u7684\u65f6\u5019\n const arr = [1, 2, 3] const str ='pink';\n[1, 2\uff0c 3].map(function (item){ console.log(item)\n])\n let a =1\nlet b=2\n;[b, a] = [a, b] console.log(a, b) <\/code><\/pre>\n\n\n\nconst [a,b,c,d]=[1,2,3]\nconsole.log(a) \/\/1\nconsole.log(b) \/\/2\nconsole.log(c) \/\/3\nconsole.log(d) \/\/underfined<\/code><\/pre>\n\n\n\nconst [a,b...c]=[1,2,3,4]\nconsole.log(a)\/\/1\nconsole.log(b)\/\/2\nconsole.log(c)\/\/[3,4]<\/code><\/pre>\n\n\n\nconst [a='\u624b\u673a',b='\u534e\u4e3a']=['\u5c0f\u7c73']\nconsole.log(a)\/\/\u5c0f\u7c73\nconsole.log(b)\/\/\u534e\u4e3a<\/code><\/pre>\n\n\n\nconst[a,b,,d]=[1,2,3,4]\nconsole.log(a)\/\/1\nconsole.log(b)\/\/2\nconsole.log(d)\/\/4<\/code><\/pre>\n\n\n\n\u591a\u7ef4\u6570\u7ec4\u89e3\u6784 <\/p>\n\n\n\n
\u5bf9\u8c61\u89e3\u6784<\/h3>\n\n\n\n
\u5bf9\u8c61\u89e3\u6784\u662f\u5c06\u5bf9\u8c61\u5c5e\u6027\u548c\u65b9\u6cd5\u5feb\u901f\u6279\u91cf\u8d4b\u503c\u7ed9\u4e00\u7cfb\u5217\u53d8\u91cf\u7684\u7b80\u6d01\u8bed\u6cd5\u3002<\/p>\n\n\n\n
1.<\/strong> \u57fa\u672c\u8bed\u6cd5\uff1a
1. \u8d4b\u503c\u8fd0\u7b97\u7b26 = \u5de6\u4fa7\u7684 {} \u7528\u4e8e\u6279\u91cf\u58f0\u660e\u53d8\u91cf\uff0c\u53f3\u4fa7\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u5c06\u88ab\u8d4b\u503c\u7ed9\u5de6\u4fa7\u7684\u53d8\u91cf
2. \u5bf9\u8c61\u5c5e\u6027\u7684\u503c\u5c06\u88ab\u8d4b\u503c\u7ed9\u4e0e\u5c5e\u6027\u540d \u76f8\u540c\u7684 \u53d8\u91cf
3. \u6ce8\u610f \u89e3\u6784\u7684\u53d8\u91cf\u540d\u4e0d\u8981\u548c\u5916\u9762\u7684\u53d8\u91cf\u540d\u51b2\u7a81 \u5426\u5219\u62a5\u9519
4.\u5bf9\u8c61\u4e2d\u627e\u4e0d\u5230\u4e0e\u53d8\u91cf\u540d\u4e00\u81f4\u7684\u5c5e\u6027\u65f6\u53d8\u91cf\u503c\u4e3a undefined<\/p>\n\n\n\n <script>\n \/\/ \u5bf9\u8c61\u89e3\u6784\n const obj = {\n uname: 'pink\u8001\u5e08',\n age: 18\n }\n \/\/ \u89e3\u6784\u7684\u8bed\u6cd5\n const { uname, age } = {age: 18, uname: 'pink\u8001\u5e08' }\n \/\/ \u7b49\u4ef7\u4e8e const uname = obj.uname\n \/\/ \u8981\u6c42\u5c5e\u6027\u540d\u548c\u53d8\u91cf\u540d\u5fc5\u987b\u4e00\u76f4\u624d\u53ef\u4ee5\n console.log(uname)\n console.log(age)\n <\/script><\/code><\/pre>\n\n\n\n <script>\n \/\/ 1. \u5bf9\u8c61\u89e3\u6784\u7684\u53d8\u91cf\u540d \u53ef\u4ee5\u91cd\u65b0\u6539\u540d \u65e7\u53d8\u91cf\u540d: \u65b0\u53d8\u91cf\u540d\n const { uname: username, age } = { uname: 'pink\u8001\u5e08', age: 18 }\n console.log(username)\n console.log(age)\n <\/script><\/code><\/pre>\n\n\n\n <script>\n \/\/ 2. \u89e3\u6784\u6570\u7ec4\u5bf9\u8c61\n const pig = [\n {\n uname: '\u4f69\u5947',\n age: 6\n }\n ]\n const [{ uname, age }] = pig\n console.log(uname)\n console.log(age)\n <\/script><\/code><\/pre>\n\n\n\n <script>\n const pig = {\n name: '\u4f69\u5947',\n family: {\n mother: '\u732a\u5988\u5988',\n father: '\u732a\u7238\u7238',\n sister: '\u4e54\u6cbb'\n },\n age: 6\n }\n \/\/ \u591a\u7ea7\u5bf9\u8c61\u89e3\u6784\n const { name, family: { mother, father, sister } } = pig\n console.log(name)\n console.log(mother)\n console.log(father)\n console.log(sister)\n \n const person = [\n {\n name: '\u4f69\u5947',\n family: {\n mother: '\u732a\u5988\u5988',\n father: '\u732a\u7238\u7238',\n sister: '\u4e54\u6cbb'\n },\n age: 6\n }\n ]\n const [{ name, family: { mother, father, sister } }] = person\n console.log(name)\n console.log(mother)\n console.log(father)\n console.log(sister)\n <\/script><\/code><\/pre>\n\n\n\n\u4fa7\u9762\u53cd\u6620\u51fa\u6570\u7ec4\u662f\u6709\u5e8f\u7684\uff0c\u5bf9\u8c61\u662f\u65e0\u5e8f\u7684 <\/p>\n\n\n\n
P159\u5bf9\u8c61\u89e3\u678420.00-32.38 \u200b<\/p>\n\n\n\n
forEach\u904d\u5386<\/h1>\n\n\n\n
forEach() \u65b9\u6cd5\u7528\u4e8e\u8c03\u7528\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5143\u7d20\u4f20\u9012\u7ed9\u56de\u8c03\u51fd\u6570<\/p>\n\n\n\n
\u4e3b\u8981\u4f7f\u7528\u573a\u666f\uff1a \u904d\u5386\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20<\/strong><\/p>\n\n\n\n\u8bed\u6cd5\n\u88ab\u904d\u5386\u7684\u6570\u7ec4.forEach(function(\u5f53\u524d\u6570\u7ec4\u5143\u7d20\uff0c\u5f53\u524d\u5143\u7d20\u7d22\u5f15\u53f7){\n\/\/\u51fd\u6570\u4f53\n})<\/code><\/pre>\n\n\n\n1. forEach \u4e3b\u8981\u662f\u904d\u5386\u6570\u7ec4
2. \u53c2\u6570\u5f53\u524d\u6570\u7ec4\u5143\u7d20\u662f\u5fc5\u987b\u8981\u5199\u7684\uff0c\u7d22\u5f15\u53f7\u53ef\u9009\u3002<\/p>\n\n\n\n
<script>\n\/\/ forEach\u5c31\u662f\u904d\u5386 \u52a0\u5f3a\u7248\u7684for\u5faa\u73af \u9002\u5408\u4e8e\u904d\u5386\u6570\u7ec4\u5bf9\u8c61 \u6709\u70b9\u50cfC17\u7684const auto i\uff1a\nconst arr ['red', 'green', 'pink']\nconstIresult arr. forEach(function (item, index){\n\n console.log(item)\/\/\u6570\u7ec4\u5143\u7d20 red green pink \n console.log(index)\/\u7d22\u5f15\u53f7\n)\n\/\/ console. Log(result) \n<\/script><\/code><\/pre>\n\n\n\n\u548cmap\u4e0d\u4e00\u6837\uff0cmap\u6709\u8fd4\u56de\u503c\uff0c\u53ef\u4ee5\u7528\u6765\u5904\u7406\u6570\u7ec4\uff0c\u7136\u540e\u8fd4\u56de\u65b0\u6570\u7ec4\uff0cforEach\u662f\u52a0\u5f3a\u7248for\u5faa\u73af\uff0c\u53ef\u4ee5\u904d\u5386\u6570\u7ec4\u5bf9\u8c61\uff0c\u5bf9\u91cc\u9762\u7684\u6570\u636e\u8fdb\u884c\u5904\u7406\uff0c\u4e0d\u5982\u63d2\u5165\u5230\u54ea\u4e2adom\u5143\u7d20\u7b49<\/p>\n\n\n\n
<body>\n <div class=\"list\">\n <!-- <div class=\"item\">\n <img src=\"\" alt=\"\">\n <p class=\"name\"><\/p>\n <p class=\"price\"><\/p>\n <\/div> -->\n <\/div>\n <script>\n const goodsList = [\n {\n id: '4001172',\n name: '\u79f0\u5fc3\u5982\u610f\u624b\u6447\u5496\u5561\u78e8\u8c46\u673a\u5496\u5561\u8c46\u7814\u78e8\u673a',\n price: '289.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/84a59ff9c58a77032564e61f716846d6.jpg',\n },\n {\n id: '4001594',\n name: '\u65e5\u5f0f\u9ed1\u9676\u529f\u592b\u8336\u7ec4\u53cc\u4fa7\u628a\u8336\u5177\u793c\u76d2\u88c5',\n price: '288.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/3346b7b92f9563c7a7e24c7ead883f18.jpg',\n },\n {\n id: '4001009',\n name: '\u7af9\u5236\u5e72\u6ce1\u8336\u76d8\u6b63\u65b9\u5f62\u6ca5\u6c34\u8336\u53f0\u54c1\u8336\u76d8',\n price: '109.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/2d942d6bc94f1e230763e1a5a3b379e1.png',\n },\n {\n id: '4001874',\n name: '\u53e4\u6cd5\u6e29\u9152\u6c5d\u74f7\u9152\u5177\u5957\u88c5\u767d\u9152\u676f\u83b2\u82b1\u6e29\u9152\u5668',\n price: '488.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/44e51622800e4fceb6bee8e616da85fd.png',\n },\n {\n id: '4001649',\n name: '\u5927\u5e08\u76d1\u5236\u9f99\u6cc9\u9752\u74f7\u8336\u53f6\u7f50',\n price: '139.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/4356c9fc150753775fe56b465314f1eb.png',\n },\n {\n id: '3997185',\n name: '\u4e0e\u4f17\u4e0d\u540c\u7684\u53e3\u611f\u6c5d\u74f7\u767d\u9152\u676f\u5957\u7ec41\u58f64\u676f',\n price: '108.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/8e21c794dfd3a4e8573273ddae50bce2.jpg',\n },\n {\n id: '3997403',\n name: '\u624b\u5de5\u5439\u5236\u66f4\u539a\u5b9e\u767d\u9152\u676f\u58f6\u5957\u88c56\u58f66\u676f',\n price: '99.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/af2371a65f60bce152a61fc22745ff3f.jpg',\n },\n {\n id: '3998274',\n name: '\u5fb7\u56fd\u767e\u5e74\u5de5\u827a\u9ad8\u7aef\u6c34\u6676\u73bb\u7483\u7ea2\u9152\u676f2\u652f\u88c5',\n price: '139.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/8896b897b3ec6639bbd1134d66b9715c.jpg',\n },\n ]\n \n \/\/ 1. \u58f0\u660e\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf\n let str = ''\n \/\/ 2. \u904d\u5386\u6570\u636e \n goodsList.forEach(item => {\n \/\/ console.log(item) \/\/ \u53ef\u4ee5\u5f97\u5230\u6bcf\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20 \u5bf9\u8c61 {id: '4001172'}\n \/\/ const {id} = item \u5bf9\u8c61\u89e3\u6784\n const { name, price, picture } = item\n str += `\n <div class=\"item\">\n <img src=${picture} alt=\"\">\n <p class=\"name\">${name}<\/p>\n <p class=\"price\">${price}<\/p>\n <\/div>\n `\n })\n \/\/ 3.\u751f\u6210\u7684 \u5b57\u7b26\u4e32 \u6dfb\u52a0\u7ed9 list \n document.querySelector('.list').innerHTML = str\n <\/script>\n<\/body><\/code><\/pre>\n\n\n\n163\u7b5b\u9009\u5546\u54c1\u6848\u4f8b<\/p>\n\n\n\n
\u6df1\u5165\u5bf9\u8c61<\/h1>\n\n\n\n
\u521b\u5efa\u5bf9\u8c61\u4e09\u79cd\u65b9\u5f0f<\/p>\n\n\n\n
1. \u5229\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u521b\u5efa\u5bf9\u8c61<\/p>\n\n\n\n
const o = {\n name:'\u5b57\u9762\u91cf'\n}<\/code><\/pre>\n\n\n\n
2. \u5229\u7528 new Object \u521b\u5efa\u5bf9\u8c61<\/p>\n\n\n\n
<script>\n \/\/ const obj = new Object()\n \/\/ obj.uname = 'pink\u8001\u5e08'\n \/\/ console.log(obj)\n const obj = new Object({ uname: 'pink' })\n console.log(obj)\n <\/script><\/code><\/pre>\n\n\n\n3. \u5229\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61 <\/p>\n\n\n\n
\u6784\u9020\u51fd\u6570<\/h3>\n\n\n\n
\u6784\u9020\u51fd\u6570 \uff1a\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u51fd\u6570\uff0c\u4e3b\u8981\u7528\u6765\u521d\u59cb\u5316\u5bf9\u8c61\uff0c\u5c31\u662foop\u7684\u7c7b<\/p>\n\n\n\n
\u4f7f\u7528\u573a\u666f\uff1a \u5e38\u89c4\u7684 {...} \u8bed\u6cd5\u5141\u8bb8\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u3002\u6bd4\u5982\u6211\u4eec\u521b\u5efa\u4e86\u4f69\u5947\u7684\u5bf9\u8c61\uff0c\u7ee7\u7eed\u521b\u5efa\u4e54\u6cbb\u7684\u5bf9\u8c61\u8fd8\u9700\u8981\u91cd\u65b0\u5199\u4e00\u904d\uff0c\u6b64\u65f6\u53ef\u4ee5\u901a\u8fc7 \u6784\u9020\u51fd\u6570 \u6765 \u5feb\u901f\u521b\u5efa\u591a\u4e2a\u7c7b\u4f3c\u7684\u5bf9\u8c61 \u3002
\u6784\u9020\u51fd\u6570\u5728\u6280\u672f\u4e0a\u662f\u5e38\u89c4\u51fd\u6570\u3002
\u4e0d\u8fc7\u6709\u4e24\u4e2a\u7ea6\u5b9a\uff1a
1. \u5b83\u4eec\u7684\u547d\u540d\u4ee5 \u5927\u5199\u5b57\u6bcd\u5f00\u5934 \u3002
2. \u5b83\u4eec\u53ea\u80fd\u7531 \" new \" \u64cd\u4f5c\u7b26\u6765\u6267\u884c\u3002
\u6784\u9020\u51fd\u6570\u8bed\u6cd5\uff1a \u5927\u5199\u5b57\u6bcd\u5f00\u5934\u7684\u51fd\u6570<\/p>\n\n\n\n
<script>\n \/\/ \u521b\u5efa\u4e00\u4e2a\u732a \u6784\u9020\u51fd\u6570 \n function Pig(uname, age) {\n this.uname = uname\n this.age = age\n }\n \n console.log(new Pig('\u4f69\u5947', 6))\n console.log(new Pig('\u4e54\u6cbb', 3))\n const p = new Pig('\u4f69\u5947', 6)\n console.log(p)\n <\/script><\/code><\/pre>\n\n\n\n1. \u4f7f\u7528 new \u5173\u952e\u5b57\u8c03\u7528\u51fd\u6570\u7684\u884c\u4e3a\u88ab\u79f0\u4e3a \u5b9e\u4f8b\u5316
2. \u5b9e\u4f8b\u5316\u6784\u9020\u51fd\u6570\u65f6\u6ca1\u6709\u53c2\u6570\u65f6\u53ef\u4ee5\u7701\u7565 ()
3. \u6784\u9020\u51fd\u6570\u5185\u90e8\u65e0\u9700\u5199return\uff0c\u8fd4\u56de\u503c\u5373\u4e3a\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u5373\u81ea\u52a8\u8fd4\u56de\u521b\u5efa\u7684\u65b0\u5bf9\u8c61
4. \u6784\u9020\u51fd\u6570\u5185\u90e8\u7684 return \u8fd4\u56de\u7684\u503c\u65e0\u6548\uff0c\u6240\u4ee5\u4e0d\u8981\u5199return
5. new Object\uff08\uff09 new Date\uff08\uff09 \u4e5f\u662f\u5b9e\u4f8b\u5316\u6784\u9020\u51fd\u6570<\/strong>
\u200b![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838427-\u5c4f\u5e55\u622a\u56fe-2024-10-25-144015.png\")
<\/p>\n\n\n\nfunction Goods(name, price, count){ this. name name\nthis. price price this. count count\nconst mi = new Goods('\u5c0f\u7c73'\uff0c 1999,20) console.log(mi)\nconst hw = new Goods('\u534e\u4e3a'\uff0c 3999,59) console. log(hw)\n\/\/ const date = new Date('2022-4-8') \/ consoLe. Log(date)<\/code><\/pre>\n\n\n\nnew\u5b9e\u4f8b\u5316\u8fc7\u7a0b<\/h3>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838481-06ea209d844d4d9d9fae47774f7b93e0-1024x559.png\")
<\/figure>\n\n\n\n \u5b9e\u4f8b\u6210\u5458\u548c\u9759\u6001\u6210\u5458<\/h3>\n\n\n\n
\u5b9e\u4f8b\u6210\u5458\uff1a
\u901a\u8fc7\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u5bf9\u8c61\u79f0\u4e3a\u5b9e\u4f8b\u5bf9\u8c61\uff0c\u5b9e\u4f8b\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u79f0\u4e3a\u5b9e\u4f8b\u6210\u5458\u3002<\/p>\n\n\n\n
JS\u4e2d\u5176\u5b9e\u662f\u6ca1\u6709\u5806\u548c\u6808\u7684\u6982\u5ff5\u7684<\/p>\n\n\n\n
\u6784\u9020\u51fd\u6570\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u88ab\u79f0\u4e3a\u9759\u6001\u6210\u5458
![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838863-\u5c4f\u5e55\u622a\u56fe-2024-10-25-144727.png\")
<\/p>\n\n\n\n
function Pig(name) {\nthis.name = name\n}\nPig.eyes = 2 \/\/ \u9759\u6001\u5c5e\u6027\nI\nPig.sayHi = function \uff08\uff09{ \/\/ \u9759\u6001\u65b9\u6cd5\nconsole.log(this)\n}\nPig.sayHi()\nconsole.log(Pig.eyes) \/\/ 2<\/code><\/pre>\n\n\n\n\u5185\u7f6e\u6784\u9020\u51fd\u6570<\/h3>\n\n\n\n
\u5728 JavaScript \u4e2d \u6700\u4e3b\u8981<\/strong> \u7684\u6570\u636e\u7c7b\u578b\u6709 6 \u79cd\uff1a
\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff1a \u5b57\u7b26\u4e32\u3001\u6570\u503c\u3001\u5e03\u5c14\u3001undefined\u3001null
\u5f15\u7528\u7c7b\u578b: \u5bf9\u8c61
\u4f46\u662f\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u6709\u4e9b\u7279\u6b8a\u60c5\u51b5\uff1a
\u5176\u5b9e\u5b57\u7b26\u4e32\u3001\u6570\u503c\u3001\u5e03\u5c14\u3001\u7b49\u57fa\u672c\u7c7b\u578b\u4e5f\u90fd\u6709\u4e13\u95e8\u7684\u6784\u9020\u51fd\u6570\uff0c\u8fd9\u4e9b\u6211\u4eec\u79f0\u4e3a \u5305\u88c5\u7c7b\u578b \u3002
JS\u4e2d\u51e0\u4e4e\u6240\u6709\u7684\u6570\u636e\u90fd\u53ef\u4ee5\u57fa\u4e8e\u6784\u9020\u51fd\u6570\u521b\u5efa<\/strong>\u3002
\u5f15\u7528\u7c7b\u578b \uff1aObject\uff0cArray\uff0cRegExp\uff0cDate \u7b49
\u5305\u88c5\u7c7b\u578b \uff1aString\uff0cNumber\uff0cBoolean \u7b49<\/p>\n\n\n\n5.1 Object
Object \u662f\u5185\u7f6e\u7684\u6784\u9020\u51fd\u6570\uff0c\u7528\u4e8e\u521b\u5efa\u666e\u901a\u5bf9\u8c61\u3002 <\/p>\n\n\n\n
\u4f46\u662f\u63a8\u8350\u4f7f\u7528\u5b57\u9762\u91cf\u65b9\u5f0f\u58f0\u660e\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f Object \u6784\u9020\u51fd\u6570 \u200b<\/p>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838905-\u5c4f\u5e55\u622a\u56fe-2024-10-25-144815.png\")
<\/figure>\n\n\n\n \u7b2c\u4e00\u79cd\u65b9\u6cd5<\/h4>\n\n\n\n1.Object.keys\n\u4f5c\u7528\uff1a Object.keys \u9759\u6001\u65b9\u6cd5\u83b7\u53d6 \u5bf9\u8c61\u4e2d\u6240\u6709\u5c5e\u6027\uff08\u952e\uff09\n\u8bed\u6cd5\uff1a\n <script>\n const o = { uname: 'pink', age: 18 }\n \/\/ 1.\u83b7\u5f97\u6240\u6709\u7684\u5c5e\u6027\u540d\n console.log(Object.keys(o)) \/\/\u8fd4\u56de\u6570\u7ec4['uname', 'age']\n <\/script>\n\u6ce8\u610f\uff1a \u8fd4\u56de\u7684\u662f\u4e00\u4e2a \u6570\u7ec4<\/code><\/pre>\n\n\n\n\u7b2c\u4e8c\u79cd\u65b9\u6cd5<\/h4>\n\n\n\n <script>\n const o = { uname: 'pink', age: 18 }\n \/\/ 2. \u83b7\u5f97\u6240\u6709\u7684\u5c5e\u6027\u503c\n console.log(Object.values(o)) \/\/ ['pink', 18]\n <\/script><\/code><\/pre>\n\n\n\n\u7b2c\u4e09\u79cd\u65b9\u6cd5<\/h4>\n\n\n\n <script>\n const o = { uname: 'pink', age: 18 }\n \/\/ 3. \u5bf9\u8c61\u7684\u62f7\u8d1d\n const oo = {}\n Object.assign(oo, o)\n console.log(oo)\n\n\n Object.assign(o, { gender: '\u5973' })\n console.log(o)\n <\/script><\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729838942-858f91a0e9a74cd4be0186fb041a9bab.png\")
<\/p>\n\n\n\n
reduce\u6570\u7ec4<\/h3>\n\n\n\n
\u4f5c\u7528\uff1a reduce \u8fd4\u56de\u51fd\u6570\u7d2f\u8ba1\u5904\u7406\u7684\u7ed3\u679c\uff0c\u7ecf\u5e38\u7528\u4e8e\u6c42\u548c\u7b49
\u57fa\u672c\u8bed\u6cd5\uff1aarr.reduce(function(\u7d2f\u8ba1\u503c, \u5f53\u524d\u5143\u7d20){}, \u8d77\u59cb\u503c)
\u53c2\u6570\uff1a \u8d77\u59cb\u503c\u53ef\u4ee5\u7701\u7565\uff0c\u5982\u679c\u5199\u5c31\u4f5c\u4e3a\u7b2c\u4e00\u6b21\u7d2f\u8ba1\u7684\u8d77\u59cb\u503c<\/p>\n\n\n\n
arr.reduce(function(){},\u8d77\u59cb\u503c)\n\n\/\/ 1. \u6ca1\u6709\u521d\u59cb\u503c\nconst total = arr.reduce(function (prev, current) {\n return prev + current \n})\n console.log(total)\n\n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c\uff08\u7b2c\u4e00\u6b21\u5faa\u574f\uff09\n 1 5 6\n \n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c \uff08\u7b2c\u4e8c\u6b21\u5faa\u574f\uff09\n 6 8 14\n\n\nconst arr = [1, 5, 8]\n\/\/ 2. \u6709\u521d\u59cb\u503c\nconst total = arr.reduce(function (prev, current) {\nreturn prev + current\n}, 10)\nconsole.log(total)\n \n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c\uff08\u7b2c\u4e00\u6b21\u5faa\u574f\uff09\n 10 1 11\n \n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c \uff08\u7b2c\u4e8c\u6b21\u5faa\u574f\uff09\n 11 5 16\n\n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c\uff08\u7b2c\u4e09\u6b21\u5faa\u574f\uff09\n 16 8 24<\/code><\/pre>\n\n\n\n\u8ba1\u7b97\u85aa\u8d44\u6848\u4f8b<\/h4>\n\n\n\nconst arr =[{\nname:'\u5f20\u4e09'\uff0c salary: 10000 },{\nname:'\u674e\u56db'\uff0c salary: 10000 },{\nname:'\u738b\u4e94'\uff0c salary: 10000 }]\n\/\/\u8ba1\u7b97\u85aa\u8d44\u6848\u4f8b\nconst total = arr. reduce((prev, current)=>{ \n\n\/\/ consoLe. Log(prev)\nreturn prev current. salary ), 0)\nconsole.log(total) \n\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c \u8fd4\u56de\u503c (\u7b2c\u4e00\u6b21\u904d\u5386) \n10000\n10000 \u2225\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c\n\u8fd4\u56de\u503c\uff08\u7b2c\u4e8c\u6b21\u904d\u5386\uff09 \/\/10000\n10000\n20000 \u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c\u8fd4\u56de\u503c\uff08\u7b2c\u4e09\u6b21\u904d\u5386\uff09 \/20000\n1000030000\n\/\/\u9700\u6c42\uff1a\u6bcf\u4e2a\u4eba\u6da8\u85aa30%\uff0c\u5f53\u6708\u652f\u51fa\u591a\u5c11\u85aa\u8d44\nconst total arr. reduce((prev, current) = prev current.salary 1.3, console.log(total)\n\u2225\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c \u8fd4\u56de\u503c\n(\u7b2c\u4e00\u6b21\u904d\u5386) \/\n13000\n13000 \/\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c \u8fd4\u56de\u503c\n(\u7b2c\u4e8c\u6b21\u904d\u5386) \/13000\n13000\n26000 \u2225\u4e0a\u6b21\u503c\n\u5f53\u524d\u503c\n\u8fd4\u56de\u503c\uff08\u7b2c\u4e09\u6b21\u904d\u5386\uff09 \/\/26000\n13000 39000 \n<\/code><\/pre>\n\n\n\narray<\/h3>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729839017-20afc64afe654cc1a5f871f9fffbe2b5.png\")
<\/figure>\n\n\n\nconst arr =[\n{\nname:'\u5c0f\u7c73'\uff0c price: 1999 \n},\n{\nname:'\u534e\u4e3a'\uff0c\nprice: 3999\n},]\n\/\/\u627e\u5c0f\u7c73\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u5e76\u4e14\u8fd4\u56de\u8fd9\u4e2a\u5bf9\u8c61\/ \nconst mi arr. find(function (item){\n console. Log(item)\/\/\n consoLe. Log(item. name)\/\/ \nconsole. Log(111)\n return item.name==='\u534e\u4e3a'\n})\nconst mi = arr.find(item =>item.name =='\u5c0f\u7c73') \nconsole.log(mi)<\/code><\/pre>\n\n\n\nconst spec ={ size: '40cm*40cm', color:'\u9ed1\u8272'} \n\/\/1.\u6240\u6709\u7684\u5c5e\u6027\u503c\u56de\u53bb\u8fc7\u6765\u6570\u7ec4\n\/\/ console. Log(Object. values(spec)) \n\/\/2.\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32join\uff08'\/'\uff09\n\/\/ console. Log(Object. vaLues(spec). join('\/))\ndocument. querySelector('div'). innerHTML Object. values(spec). join('\/') <\/code><\/pre>\n\n\n\nstring<\/h3>\n\n\n\n
1.\u5b9e\u4f8b\u5c5e\u6027length\u7528\u6765\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u5ea6\u957f\uff08\u91cd\u70b9\uff091.\u5e38\u89c1\u5b9e\u4f8b\u65b9\u6cd5<\/p>\n\n\n\n
2.\u5b9e\u4f8b\u65b9\u6cd5split\uff08\u5206\u9694\u7b26'\uff09\u7528\u6765\u5c06\u5b57\u7b26\u4e32\u62c6\u5206\u6210\u6570\u7ec4\uff08\u91cd\u70b9\uff09<\/p>\n\n\n\n
3.\u5b9e\u4f8b\u65b9\u6cd5substring\uff08\u9700\u8981\u622a\u53d6\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u7684\u7d22\u5f15[\uff0c\u7ed3\u675f\u7684\u7d22\u5f15\u53f7]\uff09\u7528\u4e8e\u5b57\u7b26\u4e32\u622a\u53d6\uff08\u91cd\u70b9\uff09<\/p>\n\n\n\n
4.\u5b9e\u4f8b\u65b9\u6cd5startswith\uff08\u68c0\u6d4b\u5b57\u7b26\u4e32[\uff0c\u68c0\u6d4b\u4f4d\u7f6e\u7d22\u5f15\u53f7]\uff09\u68c0\u6d4b\u662f\u5426\u4ee5\u67d0\u5b57\u7b26\u5f00\u5934\uff08\u91cd\u70b9]<\/p>\n\n\n\n
5.\u5b9e\u4f8b\u65b9\u6cd5includes\uff08\u641c\u7d22\u7684\u5b57\u7b26\u4e32[\uff0c\u68c0\u6d4b\u4f4d\u7f6e\u7d22\u5f15\u53f7]\uff09\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u5728\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\uff0c\u6839\u636e\u60c5\u51b5\u8fd4\u56detrue \u6216false(\u91cd\u70b9)<\/p>\n\n\n\n
6.\u5b9e\u4f8b\u65b9\u6cd5toUpperCase\u7528\u4e8e\u5c06\u5b57\u6bcd\u8f6c\u6362\u6210\u5927\u5199<\/p>\n\n\n\n
7.\u5b9e\u4f8b\u65b9\u6cd5toLowerCase\u7528\u4e8e\u5c06\u5c31\u8f6c\u6362\u6210\u5c0f\u5199<\/p>\n\n\n\n
8.\u5b9e\u4f8b\u65b9\u6cd5indexof\u68c0\u6d4b\u662f\u5426\u5305\u542b\u67d0\u5b57\u7b26<\/p>\n\n\n\n
9.\u5b9e\u4f8b\u65b9\u6cd5endswith\u68c0\u6d4b\u662f\u5426\u4ee5\u67d0\u5b57\u7b26\u7ed3\u5c3e<\/p>\n\n\n\n
10.\u5b9e\u4f8b\u65b9\u6cd5replace\u7528\u4e8e\u66ff\u6362\u5b57\u7b26\u4e32\uff0c\u652f\u6301\u6b63\u5219\u5339\u914d<\/p>\n\n\n\n
11.\u5b9e\u4f8b\u65b9\u6cd5match\u67e5\u627e\u5b57\u7b26\u4e32\uff0c\u652f\u6301\u6b63\u5219\u5339\u914d<\/p>\n\n\n\n
\u6e32\u67d3\u5546\u54c1\u6848\u4f8b<\/h3>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2024\/10\/1729839057-\u5c4f\u5e55\u622a\u56fe-2024-10-25-145036.png\")
<\/figure>\n\n\n\n\u6839\u636e\u4f60\u7684\u9700\u6c42\u6765\uff0cforeach\u662f\u9488\u5bf9\u4e8e\u6240\u6709\u7684\u6570\u636e\u904d\u5386\uff0cmap\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u4fee\u6539\u548c\u8fd4\u56de\uff0cfor\u5c31\u504f\u5411\u4e8e\u5927\u4f17\u5316\u4e00\u70b9 <\/p>\n\n\n\n
const gift='50g\u7684\u8336\u53f6\uff0c\u6e05\u6d17\u7403'\n\/\/1.\u628a\u5b57\u7b26\u4e32\u62c6\u5206\u4e3a\u6570\u7ec4\n\/\/ console. log(gift.split(','))[,]\n\/\/2.\u6839\u636e\u6570\u7ec4\u5143\u7d20\u7684\u4e2a\u6570\uff0c\u751f\u6210\u5bf9\u5e94span\u6807\u7b7e\n\/\/ const str gift. split(', ') map(function (item){ \nreturn `<span>\u3010\u54c1\u3011${ item}<\/span><br>`\n\/\/ ).join('')\n\/\/ consoLe. log(str)\n\/\/ document. querySeLector('div'). innerHTML=str\ndocument.querySelector('div').innerHTML=gift.split(',').map(item=`><span>\u3010\u8d60\u54c1\u3011${item}<\/ span><br>).join('')<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u542c\u4e86\u4ecb\u7ecd\u611f\u89c9\u5c31\u662f\u628ajs\u5728oop\u7684\u4f7f\u7528 \u4f5c\u7528\u57df \u4f5c\u7528\u57df\uff08scope\uff09\u89c4\u5b9a\u4e86\u53d8\u91cf\u80fd\u591f\u88ab\u8bbf\u95ee\u7684\u201c\u8303\u56f4\u201d\uff0c\u79bb\u5f00\u4e86\u8fd9\u4e2a\u201c\u8303\u56f4\u201d\u53d8\u91cf\u4fbf\u4e0d\u80fd\u88ab\u8bbf …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[2],"tags":[12,10],"class_list":["post-446","post","type-post","status-publish","format-standard","hentry","category-2","tag-js","tag-10"],"_links":{"self":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=446"}],"version-history":[{"count":0,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/446\/revisions"}],"wp:attachment":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
2. const \u58f0\u660e\u7684\u5e38\u91cf\u4e5f\u4f1a\u4ea7\u751f\u5757\u4f5c\u7528\u57df
3. \u4e0d\u540c\u4ee3\u7801\u5757\u4e4b\u95f4\u7684\u53d8\u91cf\u65e0\u6cd5\u4e92\u76f8\u8bbf\u95ee
4. \u63a8\u8350\u4f7f\u7528 let \u6216 const<\/p>\n\n\n\n
\u6ce8\u610f\uff1a
1. \u4e3a window \u5bf9\u8c61\u52a8\u6001\u6dfb\u52a0\u7684\u5c5e\u6027\u9ed8\u8ba4\u4e5f\u662f\u5168\u5c40\u7684\uff0c\u4e0d\u63a8\u8350\uff01
2. \u51fd\u6570\u4e2d\u672a\u4f7f\u7528\u4efb\u4f55\u5173\u952e\u5b57\u58f0\u660e\u7684\u53d8\u91cf\u4e3a\u5168\u5c40\u53d8\u91cf\uff0c\u4e0d\u63a8\u8350\uff01\uff01\uff01
3. \u5c3d\u53ef\u80fd\u5c11\u7684\u58f0\u660e\u5168\u5c40\u53d8\u91cf\uff0c\u9632\u6b62\u5168\u5c40\u53d8\u91cf\u88ab\u6c61\u67d3
JavaScript \u4e2d\u7684\u4f5c\u7528\u57df\u662f\u7a0b\u5e8f\u88ab\u6267\u884c\u65f6\u7684\u5e95\u5c42\u673a\u5236\uff0c\u4e86\u89e3\u8fd9\u4e00\u673a\u5236\u6709\u52a9\u4e8e\u89c4\u8303\u4ee3\u7801\u4e66\u5199\u4e60\u60ef\uff0c\u907f\u514d\u56e0\u4f5c\u7528\u57df\u5bfc\u81f4\u7684\u8bed\u6cd5\u9519\u8bef\u3002<\/p>\n\n\n\n
\u5728\u51fd\u6570\u88ab\u6267\u884c\u65f6\uff0c\u4f1a \u4f18\u5148\u67e5\u627e\u5f53\u524d \u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u67e5\u627e\u53d8\u91cf\u3002\u5982\u679c\u5f53\u524d\u4f5c\u7528\u57df\u67e5\u627e\u4e0d\u5230\u5219\u4f1a\u4f9d\u6b21 \u9010\u7ea7\u67e5\u627e\u7236\u7ea7\u4f5c\u7528\u57df \u76f4\u5230\u5168\u5c40\u4f5c\u7528\u57df\u3002<\/p>\n\n\n\n
2. \u76f8\u540c\u4f5c\u7528\u57df\u94fe\u4e2d\u6309\u7740 \u4ece\u5c0f\u5230\u5927 \u7684\u89c4\u5219\u67e5\u627e\u53d8\u91cf
3. \u5b50\u4f5c\u7528\u57df\u80fd\u591f\u8bbf\u95ee\u7236\u4f5c\u7528\u57df\uff0c\u7236\u7ea7\u4f5c\u7528\u57df\u65e0\u6cd5\u8bbf\u95ee\u5b50\u7ea7\u4f5c\u7528\u57df<\/p>\n\n\n\n
JS\u73af\u5883\u4e2d\u5206\u914d\u7684\u5185\u5b58, \u4e00\u822c\u6709\u5982\u4e0b\u751f\u547d\u5468\u671f\uff1a
1. \u5185\u5b58\u5206\u914d \uff1a\u5f53\u6211\u4eec\u58f0\u660e\u53d8\u91cf\u3001\u51fd\u6570\u3001\u5bf9\u8c61\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u4e3a\u4ed6\u4eec\u5206\u914d\u5185\u5b58
2. \u5185\u5b58\u4f7f\u7528 \uff1a\u5373\u8bfb\u5199\u5185\u5b58\uff0c\u4e5f\u5c31\u662f\u4f7f\u7528\u53d8\u91cf\u3001\u51fd\u6570\u7b49
3. \u5185\u5b58\u56de\u6536 \uff1a\u4f7f\u7528\u5b8c\u6bd5\uff0c\u7531\u5783\u573e\u56de\u6536\u81ea\u52a8\u56de\u6536\u4e0d\u518d\u4f7f\u7528\u7684\u5185\u5b58
\u8bf4\u660e\uff1a\u5168\u5c40\u53d8\u91cf\u4e00\u822c\u4e0d\u4f1a\u56de\u6536(\u5173\u95ed\u9875\u9762\u56de\u6536)\uff1b \u4e00\u822c\u60c5\u51b5\u4e0b\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u4e0d\u7528\u4e86, \u4f1a\u88ab\u81ea\u52a8\u56de\u6536
\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p>\n\n\n\n
\u4e0d\u518d\u7528\u5230\u7684\u5185\u5b58\uff0c\u6ca1\u6709\u53ca\u65f6\u91ca\u653e\uff0c \u5c31\u53eb\u505a \u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n\n\n\n
\u6807\u8bb0\u6e05\u9664<\/h4>\n\n\n\n\u95ed\u5305closure<\/h3>\n\n\n\n
\u7b80\u5355\u7406\u89e3\uff1a \u95ed\u5305 = \u5185\u5c42\u51fd\u6570 + \u5916\u5c42\u51fd\u6570\u7684\u53d8\u91cf
\u95ed\u5305\u4f5c\u7528\uff1a \u5c01\u95ed\u6570\u636e\uff0c\u63d0\u4f9b\u64cd\u4f5c\uff0c\u5916\u90e8\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u51fd\u6570\u5185\u90e8\u7684\u53d8\u91cf<\/p>\n\n\n\n
\/\/ \u7b80\u5355\u7684\u5199\u6cd5\n function outer() {\n let a = 10\n function fn() {\n console.log(a)\n }\n fn()\n }\n outer()===fn===function fn(){}<\/code><\/pre>\n\n\n\n \u200b<\/p>\n\n\n\n
\u662f\u5916\u90e8\u9700\u8981\u8c03\u7528\u5185\u90e8\u7684\u51fd\u6570\uff0c\u800c\u4e0d\u662f\u83b7\u53d6\u8fd9\u4e2a\u51fd\u6570\u7684\u503c<\/p>\n\n\n\n
\u5b9e\u73b0\u6570\u636e\u7684\u79c1\u6709\uff0c\u975e\u5e38\u597d\u95ed\u5305\uff0cclass private:<\/p>\n\n\n\n
\u5185\u5b58\u6cc4\u6f0f\u7684\u53ef\u80fd<\/p>\n\n\n\n
\u53d8\u91cf\u63d0\u5347<\/h3>\n\n\n\n
\u53d8\u91cf\u63d0\u5347\u662f JavaScript \u4e2d\u6bd4\u8f83\u201c\u5947\u602a\u201d\u7684\u73b0\u8c61\uff0c\u5b83\u5141\u8bb8\u5728\u53d8\u91cf\u58f0\u660e\u4e4b\u524d\u5373\u88ab\u8bbf\u95ee\uff08\u4ec5\u5b58\u5728\u4e8e var \u58f0\u660e\u53d8\u91cf\uff09
\u6ce8\u610f\uff1a
1. \u53d8\u91cf\u5728\u672a\u58f0\u660e\u5373\u88ab\u8bbf\u95ee\u65f6\u4f1a\u62a5\u8bed\u6cd5\u9519\u8bef
2. \u53d8\u91cf\u5728var\u58f0\u660e\u4e4b\u524d\u5373\u88ab\u8bbf\u95ee\uff0c\u53d8\u91cf\u7684\u503c\u4e3a undefined
3. let\/const \u58f0\u660e\u7684\u53d8\u91cf\u4e0d\u5b58\u5728\u53d8\u91cf\u63d0\u5347
4. \u53d8\u91cf\u63d0\u5347\u51fa\u73b0\u5728\u76f8\u540c\u4f5c\u7528\u57df\u5f53\u4e2d
5. \u5b9e\u9645\u5f00\u53d1\u4e2d\u63a8\u8350\u5148\u58f0\u660e\u518d\u8bbf\u95ee\u53d8\u91cf
\u8bf4\u660e\uff1a
JS\u521d\u5b66\u8005\u7ecf\u5e38\u82b1\u5f88\u591a\u65f6\u95f4\u624d\u80fd\u4e60\u60ef\u53d8\u91cf\u63d0\u5347\uff0c\u8fd8\u7ecf\u5e38\u51fa\u73b0\u4e00\u4e9b\u610f\u60f3\u4e0d\u5230\u7684bug\uff0c\u6b63\u56e0\u4e3a\u5982\u6b64\uff0cES6 \u5f15\u5165\u4e86\u5757\u7ea7\u4f5c\u7528\u57df\uff0c\u7528let \u6216\u8005 const\u58f0\u660e\u53d8\u91cf\uff0c\u8ba9\u4ee3\u7801\u5199\u6cd5\u66f4\u52a0\u89c4\u8303\u548c\u4eba\u6027\u5316\u3002
\u53d8\u91cf\u63d0\u5347\u7684\u6d41\u7a0b\uff1a
1. \u5148\u628avar \u53d8\u91cf\u63d0\u5347\u5230\u5f53\u524d\u4f5c\u7528\u57df\u4e8e\u6700\u524d\u9762
2. \u53ea\u63d0\u5347\u53d8\u91cf\u58f0\u660e\uff0c \u4e0d\u63d0\u5347\u53d8\u91cf\u8d4b\u503c
3. \u7136\u540e\u4f9d\u6b21\u6267\u884c\u4ee3\u7801
\u4e0d\u5efa\u8bae\u4f7f\u7528var\u58f0\u660e<\/p>\n\n\n\n
<\/p>\n\n\n\n
underfinedworld\uff01<\/p>\n\n\n\n
\u51fd\u6570\u8fdb\u9636<\/h1>\n\n\n\n
\u51fd\u6570\u63d0\u5347\u4e0e\u53d8\u91cf\u63d0\u5347\u6bd4\u8f83\u7c7b\u4f3c\uff0c\u662f\u6307\u51fd\u6570\u5728\u58f0\u660e\u4e4b\u524d\u5373\u53ef\u88ab\u8c03\u7528\u3002<\/p>\n\n\n\n
\u52a8\u6001\u53c2\u6570 <\/h3>\n\n\n\n <script>\n function getSum() {\n \/\/ arguments \u52a8\u6001\u53c2\u6570 \u53ea\u5b58\u5728\u4e8e \u51fd\u6570\u91cc\u9762\n \/\/ \u662f\u4f2a\u6570\u7ec4 \u91cc\u9762\u5b58\u50a8\u7684\u662f\u4f20\u9012\u8fc7\u6765\u7684\u5b9e\u53c2\n \/\/ console.log(arguments) [2,3,4][1, 2, 3, 4, 2, 2, 3, 4]\n let sum = 0\n for (let i = 0; i < arguments.length; i++) {\n sum += arguments[i]\n }\n console.log(sum)\n }\n getSum(2, 3, 4)\n getSum(1, 2, 3, 4, 2, 2, 3, 4)\n <\/script><\/code><\/pre>\n\n\n\n1. arguments \u662f\u4e00\u4e2a \u4f2a\u6570\u7ec4 \uff0c\u53ea\u5b58\u5728\u4e8e\u51fd\u6570\u4e2d
2. arguments \u7684\u4f5c\u7528\u662f \u52a8\u6001\u83b7\u53d6\u51fd\u6570\u7684\u5b9e\u53c2<\/p>\n\n\n\n
\u5269\u4f59\u53c2\u6570<\/h2>\n\n\n\n
\u5269\u4f59\u53c2\u6570\u5141\u8bb8\u6211\u4eec\u5c06\u4e00\u4e2a\u4e0d\u5b9a\u6570\u91cf\u7684\u53c2\u6570\u8868\u793a\u4e3a\u4e00\u4e2a\u6570\u7ec4<\/p>\n\n\n\n
\u5269\u4f59\u53c2\u6570\u4e3b\u8981\u7684\u4f7f\u7528\u573a\u666f<\/strong>\uff1a \u7528\u4e8e\u83b7\u53d6\u591a\u4f59\u7684\u5b9e\u53c2<\/p>\n\n\n\n <script>\n function getSum(...arr) {\n console.log(arr) \/\/ \u4f7f\u7528\u7684\u65f6\u5019\u4e0d\u9700\u8981\u5199 ...\n }\n getSum(2, 3) \/\/ [2\uff0c3]\n getSum(1, 2, 3, 4, 5) \/\/ [1\uff0c2\uff0c3,4,5]\n <\/script><\/code><\/pre>\n\n\n\n <script>\n function getSum(a, b, ...arr) {\n console.log(arr) \/\/ \u4f7f\u7528\u7684\u65f6\u5019\u4e0d\u9700\u8981\u5199 ...\n }\n getSum(2, 3) \/\/ []\n getSum(1, 2, 3, 4, 5) \/\/ [3,4,5]\n <\/script><\/code><\/pre>\n\n\n\n1. ... \u662f\u8bed\u6cd5\u7b26\u53f7\uff0c\u7f6e\u4e8e\u6700\u672b\u51fd\u6570\u5f62\u53c2\u4e4b\u524d\uff0c\u7528\u4e8e\u83b7\u53d6 \u591a\u4f59 \u7684\u5b9e\u53c2
2. \u501f\u52a9 ... \u83b7\u53d6\u7684\u5269\u4f59\u5b9e\u53c2\uff0c\u662f\u4e2a \u771f\u6570\u7ec4
\u5269\u4f59\u53c2\u6570\u548c\u52a8\u6001\u53c2\u6570\u533a\u522b\uff1a \u52a8\u6001\u53c2\u6570\u662f\u4f2a\u6570\u7ec4\uff0c\u5269\u4f59\u53c2\u6570\u662f\u771f\u6570\u7ec4
\u5f00\u53d1\u4e2d\uff0c\u8fd8\u662f\u63d0\u5021\u591a\u4f7f\u7528 \u5269\u4f59\u53c2\u6570<\/strong><\/p>\n\n\n\n\u5c55\u5f00\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n
\u5c55\u5f00\u8fd0\u7b97\u7b26(\u2026)\uff0c\u5c06\u4e00\u4e2a\u6570\u7ec4\u8fdb\u884c\u5c55\u5f00\uff0c\u4e0d\u4f1a\u4fee\u6539\u539f\u6570\u7ec4<\/p>\n\n\n\n
\u5178\u578b\u8fd0\u7528\u573a\u666f\uff1a <\/strong>\u6c42\u6570\u7ec4\u6700\u5927\u503c(\u6700\u5c0f\u503c)\u3001\u5408\u5e76\u6570\u7ec4\u7b49<\/p>\n\n\n\n\u5bf9\u4e8e\u6c42\u6700\u5927\u503c\uff0c\u6709Math.max\uff08\uff09\u8fd9\u4e00\u65b9\u6cd5\uff0c\u4f46\u662f\u53ea\u662f\u7528\u4e8estring\u6c42max\uff0c\u5bf9\u4e8e\u6570\u7ec4\u65e0\u6cd5\u8bc6\u522b\uff0c\u56e0\u6b64\u7528\u5c55\u5f00\u8fd0\u7b97\u7b26<\/p>\n\n\n\n
const arr=[1,2,1,5,1,1,2,6,5,9]\nconsole.log(...arr)\nconsole.log(Math.max(...arr))\/\/9\n\nconsole.log(Math.min(...arr))\/\/1<\/code><\/pre>\n\n\n\nlog\u62ec\u53f7\u5185\u53ef\u4ee5\u6253\u5370\u591a\u4e2a\u53c2\u6570\uff0c\u7528\u9017\u53f7\u9694\u5f00\uff0c\u6253\u5370\u7ed3\u679c\u5c31\u662f\u591a\u4e2a\u53c2\u6570\u662f\u5728\u63a7\u5236\u53f0\u7528\u7a7a\u683c\u9694\u5f00 <\/p>\n\n\n\n
\u5bf9\u4e8e\u5408\u5e76\u6570\u7ec4\uff0c<\/p>\n\n\n\n
const arr1=[1,2,3]\nconst arr2 = [4, 5]\n const arr = [...arr1, ...arr2]\n console.log(arr) \/\/ [1,2,3,4,5]<\/code><\/pre>\n\n\n\n\u7bad\u5934\u51fd\u6570<\/h2>\n\n\n\n
\u5f15\u5165\u7bad\u5934\u51fd\u6570\u7684\u76ee\u7684\u662f\u66f4\u7b80\u77ed\u7684\u51fd\u6570\u548c\u4e0d\u7528this\uff0c\u66f4\u5b9e\u7528\u4e8e\u9700\u8981\u533f\u540d\u51fd\u6570\u7684\u5730\u65b9<\/p>\n\n\n\n
\u57fa\u672c\u8bed\u6cd5\nconst fn=()=>{\n console.log(123)\n}\nfn()\n\/\/123\n\n\nconst fn=(x)=>{\n console.log(x)\n}\nfn(1)<\/code><\/pre>\n\n\n\n\u53ea\u6709\u4e00\u4e2a\u5f62\u53c2\u53ef\u4ee5\u7701\u7565\u5c0f\u62ec\u53f7\nconst fn= x =>{\n console.log(x)\n}\nfn(1)\n\n\u53ea\u8981\u4e00\u884c\u4ee3\u7801\u53ef\u4ee5\u7701\u7565\u5927\u62ec\u53f7\nconst fn = x => console.log(x)\nfn(1)\n\n\u53ea\u6709\u4e00\u884c\u4ee3\u7801\u53ef\u4ee5\u7701\u7565return\nconst fn=x=>x+x\nconsole.log(fn(1))\n\nconst fn=(x,y)=>x+y\nconsole.log(fn(1,2))\n\n\u52a0\u62ec\u53f7\u7684\u51fd\u6570\u4f53\u8fd4\u56de\u5bf9\u8c61\u5b57\u9762\u91cf\uff0c\u52a0\uff1a\nconst fn =(uname)=>({name:uname})\nconsole.log(fn('kobe'))\n\u76f4\u63a5\u8fd4\u56de\u5bf9\u8c61<\/code><\/pre>\n\n\n\n\u7bad\u5934\u51fd\u6570\u5c5e\u4e8e\u8868\u8fbe\u5f0f\u51fd\u6570\uff0c\u56e0\u6b64\u4e0d\u5b58\u5728\u51fd\u6570\u63d0\u5347 <\/p>\n\n\n\n
1. \u666e\u901a\u51fd\u6570\u6709arguments \u52a8\u6001\u53c2\u6570
2. \u7bad\u5934\u51fd\u6570 \u6ca1\u6709 arguments \u52a8\u6001\u53c2\u6570\uff0c\u4f46\u662f \u6709\u5269\u4f59\u53c2\u6570 ..args<\/p>\n\n\n\n
<script>\n \/\/ 1. \u5229\u7528\u7bad\u5934\u51fd\u6570\u6765\u6c42\u548c\n const getSum = (...arr) => {\n let sum = 0\n for (let i = 0; i < arr.length; i++) {\n sum += arr[i]\n }\n return sum\n }\n const result = getSum(2, 3, 4)\n console.log(result) \/\/ 9\n <\/script><\/code><\/pre>\n\n\n\nthis\u6307\u5411\u95ee\u9898<\/h4>\n\n\n\n <script>\n \/\/ \u4ee5\u524dthis\u7684\u6307\u5411\uff1a \u8c01\u8c03\u7528\u7684\u8fd9\u4e2a\u51fd\u6570\uff0cthis \u5c31\u6307\u5411\u8c01\n \/\/ console.log(this) \/\/ window\n \/\/ \/\/ \u666e\u901a\u51fd\u6570\n \/\/ function fn() {\n \/\/ console.log(this) \/\/ window\n \/\/ }\n \/\/ window.fn()\n \/\/ \/\/ \u5bf9\u8c61\u65b9\u6cd5\u91cc\u9762\u7684this\n \/\/ const obj = {\n \/\/ name: 'andy',\n \/\/ sayHi: function () {\n \/\/ console.log(this) \/\/ obj\n \/\/ }\n \/\/ }\n \/\/ obj.sayHi()\n \n \/\/ 2. \u7bad\u5934\u51fd\u6570\u7684this \u662f\u4e0a\u4e00\u5c42\u4f5c\u7528\u57df\u7684this \u6307\u5411\n \/\/ const fn = () => {\n \/\/ console.log(this) \/\/ window\n \/\/ }\n \/\/ fn()\n \/\/ \u5bf9\u8c61\u65b9\u6cd5\u7bad\u5934\u51fd\u6570 this\n\n \/\/ const obj = {\n \/\/ uname: 'pink\u8001\u5e08',\n \/\/ sayHi: () => {\n \/\/ console.log(this) \/\/ this \u6307\u5411\u8c01\uff1f window\n\/\/\u56e0\u4e3a\u7bad\u5934\u51fd\u6570\u6ca1\u6709this \u662f\u4ece\u5f53\u524d\u4f5c\u7528\u57df\u7684\u4e0a\u4e00\u5c42\u4f5c\u7528\u57dfthis \u7684\u6307\u5411 sayHi\u7684\u4e0a\u4e00\u5c42\u662fobj \n\/\/obj\u7684\u8c01\u8c03\u7528 this\u5c31\u6307\u5411\u8c01 \u662fwindow\u8c03\u7528 \u6240\u4ee5\u662fwindow\n \/\/ }\n \/\/ }\n \/\/ obj.sayHi()\n \n const obj = {\n uname: 'pink\u8001\u5e08',\n sayHi: function () {\n console.log(this) \/\/ obj\n let i = 10\n const count = () => {\n console.log(this) \/\/ obj \n }\n count()\n }\n }\n obj.sayHi()\n \u5b9e\u5728\u770b\u4e0d\u51fa\u7bad\u5934\u51fd\u6570\u5185\u7684this\u6307\u5411\u8c01\uff0c\u5c31\u628a\u5b83\u6362\u6210\u666e\u901a\u51fd\u6570\u8bd5\u4e00\u4e0b\uff0c\n\u627e\u5230\u666e\u901a\u51fd\u6570\u7684this\u540e\u518d\u5f80\u4e0a\u627e\u4e00\u7ea7\u5c31\u597d\u4e86\n <\/script><\/code><\/pre>\n\n\n\n\u7bad\u5934\u51fd\u6570\u4e0d\u4f1a\u521b\u5efa\u81ea\u5df1\u7684this\uff0c\u4ed6\u53ea\u4f1a\u4ece\u81ea\u5df1\u7684\u4f5c\u7528\u57df\u94fe\u4e0a\u4e00\u7ea7\u6cbf\u7528this<\/p>\n\n\n\n
\u5728\u5f00\u53d1\u4e2d\u4f7f\u7528\u7bad\u5934\u51fd\u6570\u8981\u8003\u8651\u51fd\u6570\u7684this\u7684\u503c\uff0c\u4e8b\u4ef6\u56de\u8c03\u51fd\u6570\u4f7f\u7528\u7bad\u5934\u51fd\u6570\uff0cthis\u662f\u5168\u5c40\u7684window\uff0c\u56e0\u6b64DOM\u56de\u8c03\u51fd\u6570\u4e3a\u4e86\u7b80\u4fbf\uff0c\u4e0d\u662f\u5f88\u63a8\u8350\u7bad\u5934\u51fd\u6570<\/p>\n\n\n\n
\u89e3\u6784\u8d4b\u503c<\/h2>\n\n\n\n<\/figure>\n\n\n\n \u6570\u7ec4\u89e3\u6784<\/h3>\n\n\n\n
\u5c06\u6570\u7ec4\u7684\u5355\u5143\u503c\u5feb\u901f\u6279\u91cf\u8d4b\u503c\u7ed9\u4e00\u7cfb\u5217\u53d8\u91cf\u7684\u7b80\u4ecb\u8bed\u6cd5<\/p>\n\n\n\n
const arr=[100,60,80]\nconst [max,min,avg]=[100,60,80]<\/code><\/pre>\n\n\n\n\u4ea4\u6362\u53d8\u91cf\nlet a=1\nlet b=2;\n\n[b,a]=[a,b]<\/code><\/pre>\n\n\n\n<\/figure>\n\n\n\n1.\u7acb\u5373\u6267\u884c\u51fd\u6570\u8981\u52a0\n (function ( })() \/\/(function ( })() \n\n2\u3001\u4f7f\u7528\u6570\u7ec4\u7684\u65f6\u5019\n const arr = [1, 2, 3] const str ='pink';\n[1, 2\uff0c 3].map(function (item){ console.log(item)\n])\n let a =1\nlet b=2\n;[b, a] = [a, b] console.log(a, b) <\/code><\/pre>\n\n\n\nconst [a,b,c,d]=[1,2,3]\nconsole.log(a) \/\/1\nconsole.log(b) \/\/2\nconsole.log(c) \/\/3\nconsole.log(d) \/\/underfined<\/code><\/pre>\n\n\n\nconst [a,b...c]=[1,2,3,4]\nconsole.log(a)\/\/1\nconsole.log(b)\/\/2\nconsole.log(c)\/\/[3,4]<\/code><\/pre>\n\n\n\nconst [a='\u624b\u673a',b='\u534e\u4e3a']=['\u5c0f\u7c73']\nconsole.log(a)\/\/\u5c0f\u7c73\nconsole.log(b)\/\/\u534e\u4e3a<\/code><\/pre>\n\n\n\nconst[a,b,,d]=[1,2,3,4]\nconsole.log(a)\/\/1\nconsole.log(b)\/\/2\nconsole.log(d)\/\/4<\/code><\/pre>\n\n\n\n\u591a\u7ef4\u6570\u7ec4\u89e3\u6784 <\/p>\n\n\n\n
\u5bf9\u8c61\u89e3\u6784<\/h3>\n\n\n\n
\u5bf9\u8c61\u89e3\u6784\u662f\u5c06\u5bf9\u8c61\u5c5e\u6027\u548c\u65b9\u6cd5\u5feb\u901f\u6279\u91cf\u8d4b\u503c\u7ed9\u4e00\u7cfb\u5217\u53d8\u91cf\u7684\u7b80\u6d01\u8bed\u6cd5\u3002<\/p>\n\n\n\n
1.<\/strong> \u57fa\u672c\u8bed\u6cd5\uff1a
1. \u8d4b\u503c\u8fd0\u7b97\u7b26 = \u5de6\u4fa7\u7684 {} \u7528\u4e8e\u6279\u91cf\u58f0\u660e\u53d8\u91cf\uff0c\u53f3\u4fa7\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u5c06\u88ab\u8d4b\u503c\u7ed9\u5de6\u4fa7\u7684\u53d8\u91cf
2. \u5bf9\u8c61\u5c5e\u6027\u7684\u503c\u5c06\u88ab\u8d4b\u503c\u7ed9\u4e0e\u5c5e\u6027\u540d \u76f8\u540c\u7684 \u53d8\u91cf
3. \u6ce8\u610f \u89e3\u6784\u7684\u53d8\u91cf\u540d\u4e0d\u8981\u548c\u5916\u9762\u7684\u53d8\u91cf\u540d\u51b2\u7a81 \u5426\u5219\u62a5\u9519
4.\u5bf9\u8c61\u4e2d\u627e\u4e0d\u5230\u4e0e\u53d8\u91cf\u540d\u4e00\u81f4\u7684\u5c5e\u6027\u65f6\u53d8\u91cf\u503c\u4e3a undefined<\/p>\n\n\n\n <script>\n \/\/ \u5bf9\u8c61\u89e3\u6784\n const obj = {\n uname: 'pink\u8001\u5e08',\n age: 18\n }\n \/\/ \u89e3\u6784\u7684\u8bed\u6cd5\n const { uname, age } = {age: 18, uname: 'pink\u8001\u5e08' }\n \/\/ \u7b49\u4ef7\u4e8e const uname = obj.uname\n \/\/ \u8981\u6c42\u5c5e\u6027\u540d\u548c\u53d8\u91cf\u540d\u5fc5\u987b\u4e00\u76f4\u624d\u53ef\u4ee5\n console.log(uname)\n console.log(age)\n <\/script><\/code><\/pre>\n\n\n\n <script>\n \/\/ 1. \u5bf9\u8c61\u89e3\u6784\u7684\u53d8\u91cf\u540d \u53ef\u4ee5\u91cd\u65b0\u6539\u540d \u65e7\u53d8\u91cf\u540d: \u65b0\u53d8\u91cf\u540d\n const { uname: username, age } = { uname: 'pink\u8001\u5e08', age: 18 }\n console.log(username)\n console.log(age)\n <\/script><\/code><\/pre>\n\n\n\n <script>\n \/\/ 2. \u89e3\u6784\u6570\u7ec4\u5bf9\u8c61\n const pig = [\n {\n uname: '\u4f69\u5947',\n age: 6\n }\n ]\n const [{ uname, age }] = pig\n console.log(uname)\n console.log(age)\n <\/script><\/code><\/pre>\n\n\n\n <script>\n const pig = {\n name: '\u4f69\u5947',\n family: {\n mother: '\u732a\u5988\u5988',\n father: '\u732a\u7238\u7238',\n sister: '\u4e54\u6cbb'\n },\n age: 6\n }\n \/\/ \u591a\u7ea7\u5bf9\u8c61\u89e3\u6784\n const { name, family: { mother, father, sister } } = pig\n console.log(name)\n console.log(mother)\n console.log(father)\n console.log(sister)\n \n const person = [\n {\n name: '\u4f69\u5947',\n family: {\n mother: '\u732a\u5988\u5988',\n father: '\u732a\u7238\u7238',\n sister: '\u4e54\u6cbb'\n },\n age: 6\n }\n ]\n const [{ name, family: { mother, father, sister } }] = person\n console.log(name)\n console.log(mother)\n console.log(father)\n console.log(sister)\n <\/script><\/code><\/pre>\n\n\n\n\u4fa7\u9762\u53cd\u6620\u51fa\u6570\u7ec4\u662f\u6709\u5e8f\u7684\uff0c\u5bf9\u8c61\u662f\u65e0\u5e8f\u7684 <\/p>\n\n\n\n
P159\u5bf9\u8c61\u89e3\u678420.00-32.38 \u200b<\/p>\n\n\n\n
forEach\u904d\u5386<\/h1>\n\n\n\n
forEach() \u65b9\u6cd5\u7528\u4e8e\u8c03\u7528\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5143\u7d20\u4f20\u9012\u7ed9\u56de\u8c03\u51fd\u6570<\/p>\n\n\n\n
\u4e3b\u8981\u4f7f\u7528\u573a\u666f\uff1a \u904d\u5386\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20<\/strong><\/p>\n\n\n\n\u8bed\u6cd5\n\u88ab\u904d\u5386\u7684\u6570\u7ec4.forEach(function(\u5f53\u524d\u6570\u7ec4\u5143\u7d20\uff0c\u5f53\u524d\u5143\u7d20\u7d22\u5f15\u53f7){\n\/\/\u51fd\u6570\u4f53\n})<\/code><\/pre>\n\n\n\n1. forEach \u4e3b\u8981\u662f\u904d\u5386\u6570\u7ec4
2. \u53c2\u6570\u5f53\u524d\u6570\u7ec4\u5143\u7d20\u662f\u5fc5\u987b\u8981\u5199\u7684\uff0c\u7d22\u5f15\u53f7\u53ef\u9009\u3002<\/p>\n\n\n\n
<script>\n\/\/ forEach\u5c31\u662f\u904d\u5386 \u52a0\u5f3a\u7248\u7684for\u5faa\u73af \u9002\u5408\u4e8e\u904d\u5386\u6570\u7ec4\u5bf9\u8c61 \u6709\u70b9\u50cfC17\u7684const auto i\uff1a\nconst arr ['red', 'green', 'pink']\nconstIresult arr. forEach(function (item, index){\n\n console.log(item)\/\/\u6570\u7ec4\u5143\u7d20 red green pink \n console.log(index)\/\u7d22\u5f15\u53f7\n)\n\/\/ console. Log(result) \n<\/script><\/code><\/pre>\n\n\n\n\u548cmap\u4e0d\u4e00\u6837\uff0cmap\u6709\u8fd4\u56de\u503c\uff0c\u53ef\u4ee5\u7528\u6765\u5904\u7406\u6570\u7ec4\uff0c\u7136\u540e\u8fd4\u56de\u65b0\u6570\u7ec4\uff0cforEach\u662f\u52a0\u5f3a\u7248for\u5faa\u73af\uff0c\u53ef\u4ee5\u904d\u5386\u6570\u7ec4\u5bf9\u8c61\uff0c\u5bf9\u91cc\u9762\u7684\u6570\u636e\u8fdb\u884c\u5904\u7406\uff0c\u4e0d\u5982\u63d2\u5165\u5230\u54ea\u4e2adom\u5143\u7d20\u7b49<\/p>\n\n\n\n
<body>\n <div class=\"list\">\n <!-- <div class=\"item\">\n <img src=\"\" alt=\"\">\n <p class=\"name\"><\/p>\n <p class=\"price\"><\/p>\n <\/div> -->\n <\/div>\n <script>\n const goodsList = [\n {\n id: '4001172',\n name: '\u79f0\u5fc3\u5982\u610f\u624b\u6447\u5496\u5561\u78e8\u8c46\u673a\u5496\u5561\u8c46\u7814\u78e8\u673a',\n price: '289.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/84a59ff9c58a77032564e61f716846d6.jpg',\n },\n {\n id: '4001594',\n name: '\u65e5\u5f0f\u9ed1\u9676\u529f\u592b\u8336\u7ec4\u53cc\u4fa7\u628a\u8336\u5177\u793c\u76d2\u88c5',\n price: '288.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/3346b7b92f9563c7a7e24c7ead883f18.jpg',\n },\n {\n id: '4001009',\n name: '\u7af9\u5236\u5e72\u6ce1\u8336\u76d8\u6b63\u65b9\u5f62\u6ca5\u6c34\u8336\u53f0\u54c1\u8336\u76d8',\n price: '109.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/2d942d6bc94f1e230763e1a5a3b379e1.png',\n },\n {\n id: '4001874',\n name: '\u53e4\u6cd5\u6e29\u9152\u6c5d\u74f7\u9152\u5177\u5957\u88c5\u767d\u9152\u676f\u83b2\u82b1\u6e29\u9152\u5668',\n price: '488.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/44e51622800e4fceb6bee8e616da85fd.png',\n },\n {\n id: '4001649',\n name: '\u5927\u5e08\u76d1\u5236\u9f99\u6cc9\u9752\u74f7\u8336\u53f6\u7f50',\n price: '139.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/4356c9fc150753775fe56b465314f1eb.png',\n },\n {\n id: '3997185',\n name: '\u4e0e\u4f17\u4e0d\u540c\u7684\u53e3\u611f\u6c5d\u74f7\u767d\u9152\u676f\u5957\u7ec41\u58f64\u676f',\n price: '108.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/8e21c794dfd3a4e8573273ddae50bce2.jpg',\n },\n {\n id: '3997403',\n name: '\u624b\u5de5\u5439\u5236\u66f4\u539a\u5b9e\u767d\u9152\u676f\u58f6\u5957\u88c56\u58f66\u676f',\n price: '99.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/af2371a65f60bce152a61fc22745ff3f.jpg',\n },\n {\n id: '3998274',\n name: '\u5fb7\u56fd\u767e\u5e74\u5de5\u827a\u9ad8\u7aef\u6c34\u6676\u73bb\u7483\u7ea2\u9152\u676f2\u652f\u88c5',\n price: '139.00',\n picture: 'https:\/\/yanxuan-item.nosdn.127.net\/8896b897b3ec6639bbd1134d66b9715c.jpg',\n },\n ]\n \n \/\/ 1. \u58f0\u660e\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf\n let str = ''\n \/\/ 2. \u904d\u5386\u6570\u636e \n goodsList.forEach(item => {\n \/\/ console.log(item) \/\/ \u53ef\u4ee5\u5f97\u5230\u6bcf\u4e00\u4e2a\u6570\u7ec4\u5143\u7d20 \u5bf9\u8c61 {id: '4001172'}\n \/\/ const {id} = item \u5bf9\u8c61\u89e3\u6784\n const { name, price, picture } = item\n str += `\n <div class=\"item\">\n <img src=${picture} alt=\"\">\n <p class=\"name\">${name}<\/p>\n <p class=\"price\">${price}<\/p>\n <\/div>\n `\n })\n \/\/ 3.\u751f\u6210\u7684 \u5b57\u7b26\u4e32 \u6dfb\u52a0\u7ed9 list \n document.querySelector('.list').innerHTML = str\n <\/script>\n<\/body><\/code><\/pre>\n\n\n\n163\u7b5b\u9009\u5546\u54c1\u6848\u4f8b<\/p>\n\n\n\n
\u6df1\u5165\u5bf9\u8c61<\/h1>\n\n\n\n
\u521b\u5efa\u5bf9\u8c61\u4e09\u79cd\u65b9\u5f0f<\/p>\n\n\n\n
1. \u5229\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u521b\u5efa\u5bf9\u8c61<\/p>\n\n\n\n
const o = {\n name:'\u5b57\u9762\u91cf'\n}<\/code><\/pre>\n\n\n\n
2. \u5229\u7528 new Object \u521b\u5efa\u5bf9\u8c61<\/p>\n\n\n\n
<script>\n \/\/ const obj = new Object()\n \/\/ obj.uname = 'pink\u8001\u5e08'\n \/\/ console.log(obj)\n const obj = new Object({ uname: 'pink' })\n console.log(obj)\n <\/script><\/code><\/pre>\n\n\n\n3. \u5229\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61 <\/p>\n\n\n\n
\u6784\u9020\u51fd\u6570<\/h3>\n\n\n\n
\u6784\u9020\u51fd\u6570 \uff1a\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u51fd\u6570\uff0c\u4e3b\u8981\u7528\u6765\u521d\u59cb\u5316\u5bf9\u8c61\uff0c\u5c31\u662foop\u7684\u7c7b<\/p>\n\n\n\n
\u4f7f\u7528\u573a\u666f\uff1a \u5e38\u89c4\u7684 {...} \u8bed\u6cd5\u5141\u8bb8\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u3002\u6bd4\u5982\u6211\u4eec\u521b\u5efa\u4e86\u4f69\u5947\u7684\u5bf9\u8c61\uff0c\u7ee7\u7eed\u521b\u5efa\u4e54\u6cbb\u7684\u5bf9\u8c61\u8fd8\u9700\u8981\u91cd\u65b0\u5199\u4e00\u904d\uff0c\u6b64\u65f6\u53ef\u4ee5\u901a\u8fc7 \u6784\u9020\u51fd\u6570 \u6765 \u5feb\u901f\u521b\u5efa\u591a\u4e2a\u7c7b\u4f3c\u7684\u5bf9\u8c61 \u3002
\u6784\u9020\u51fd\u6570\u5728\u6280\u672f\u4e0a\u662f\u5e38\u89c4\u51fd\u6570\u3002
\u4e0d\u8fc7\u6709\u4e24\u4e2a\u7ea6\u5b9a\uff1a
1. \u5b83\u4eec\u7684\u547d\u540d\u4ee5 \u5927\u5199\u5b57\u6bcd\u5f00\u5934 \u3002
2. \u5b83\u4eec\u53ea\u80fd\u7531 \" new \" \u64cd\u4f5c\u7b26\u6765\u6267\u884c\u3002
\u6784\u9020\u51fd\u6570\u8bed\u6cd5\uff1a \u5927\u5199\u5b57\u6bcd\u5f00\u5934\u7684\u51fd\u6570<\/p>\n\n\n\n
<script>\n \/\/ \u521b\u5efa\u4e00\u4e2a\u732a \u6784\u9020\u51fd\u6570 \n function Pig(uname, age) {\n this.uname = uname\n this.age = age\n }\n \n console.log(new Pig('\u4f69\u5947', 6))\n console.log(new Pig('\u4e54\u6cbb', 3))\n const p = new Pig('\u4f69\u5947', 6)\n console.log(p)\n <\/script><\/code><\/pre>\n\n\n\n1. \u4f7f\u7528 new \u5173\u952e\u5b57\u8c03\u7528\u51fd\u6570\u7684\u884c\u4e3a\u88ab\u79f0\u4e3a \u5b9e\u4f8b\u5316
2. \u5b9e\u4f8b\u5316\u6784\u9020\u51fd\u6570\u65f6\u6ca1\u6709\u53c2\u6570\u65f6\u53ef\u4ee5\u7701\u7565 ()
3. \u6784\u9020\u51fd\u6570\u5185\u90e8\u65e0\u9700\u5199return\uff0c\u8fd4\u56de\u503c\u5373\u4e3a\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u5373\u81ea\u52a8\u8fd4\u56de\u521b\u5efa\u7684\u65b0\u5bf9\u8c61
4. \u6784\u9020\u51fd\u6570\u5185\u90e8\u7684 return \u8fd4\u56de\u7684\u503c\u65e0\u6548\uff0c\u6240\u4ee5\u4e0d\u8981\u5199return
5. new Object\uff08\uff09 new Date\uff08\uff09 \u4e5f\u662f\u5b9e\u4f8b\u5316\u6784\u9020\u51fd\u6570<\/strong>
\u200b<\/p>\n\n\n\nfunction Goods(name, price, count){ this. name name\nthis. price price this. count count\nconst mi = new Goods('\u5c0f\u7c73'\uff0c 1999,20) console.log(mi)\nconst hw = new Goods('\u534e\u4e3a'\uff0c 3999,59) console. log(hw)\n\/\/ const date = new Date('2022-4-8') \/ consoLe. Log(date)<\/code><\/pre>\n\n\n\nnew\u5b9e\u4f8b\u5316\u8fc7\u7a0b<\/h3>\n\n\n\n<\/figure>\n\n\n\n \u5b9e\u4f8b\u6210\u5458\u548c\u9759\u6001\u6210\u5458<\/h3>\n\n\n\n
\u5b9e\u4f8b\u6210\u5458\uff1a
\u901a\u8fc7\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u5bf9\u8c61\u79f0\u4e3a\u5b9e\u4f8b\u5bf9\u8c61\uff0c\u5b9e\u4f8b\u5bf9\u8c61\u4e2d\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u79f0\u4e3a\u5b9e\u4f8b\u6210\u5458\u3002<\/p>\n\n\n\n
JS\u4e2d\u5176\u5b9e\u662f\u6ca1\u6709\u5806\u548c\u6808\u7684\u6982\u5ff5\u7684<\/p>\n\n\n\n
\u6784\u9020\u51fd\u6570\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u88ab\u79f0\u4e3a\u9759\u6001\u6210\u5458
<\/p>\n\n\n\n
function Pig(name) {\nthis.name = name\n}\nPig.eyes = 2 \/\/ \u9759\u6001\u5c5e\u6027\nI\nPig.sayHi = function \uff08\uff09{ \/\/ \u9759\u6001\u65b9\u6cd5\nconsole.log(this)\n}\nPig.sayHi()\nconsole.log(Pig.eyes) \/\/ 2<\/code><\/pre>\n\n\n\n\u5185\u7f6e\u6784\u9020\u51fd\u6570<\/h3>\n\n\n\n
\u5728 JavaScript \u4e2d \u6700\u4e3b\u8981<\/strong> \u7684\u6570\u636e\u7c7b\u578b\u6709 6 \u79cd\uff1a
\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff1a \u5b57\u7b26\u4e32\u3001\u6570\u503c\u3001\u5e03\u5c14\u3001undefined\u3001null
\u5f15\u7528\u7c7b\u578b: \u5bf9\u8c61
\u4f46\u662f\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u6709\u4e9b\u7279\u6b8a\u60c5\u51b5\uff1a
\u5176\u5b9e\u5b57\u7b26\u4e32\u3001\u6570\u503c\u3001\u5e03\u5c14\u3001\u7b49\u57fa\u672c\u7c7b\u578b\u4e5f\u90fd\u6709\u4e13\u95e8\u7684\u6784\u9020\u51fd\u6570\uff0c\u8fd9\u4e9b\u6211\u4eec\u79f0\u4e3a \u5305\u88c5\u7c7b\u578b \u3002
JS\u4e2d\u51e0\u4e4e\u6240\u6709\u7684\u6570\u636e\u90fd\u53ef\u4ee5\u57fa\u4e8e\u6784\u9020\u51fd\u6570\u521b\u5efa<\/strong>\u3002
\u5f15\u7528\u7c7b\u578b \uff1aObject\uff0cArray\uff0cRegExp\uff0cDate \u7b49
\u5305\u88c5\u7c7b\u578b \uff1aString\uff0cNumber\uff0cBoolean \u7b49<\/p>\n\n\n\n5.1 Object
Object \u662f\u5185\u7f6e\u7684\u6784\u9020\u51fd\u6570\uff0c\u7528\u4e8e\u521b\u5efa\u666e\u901a\u5bf9\u8c61\u3002 <\/p>\n\n\n\n
\u4f46\u662f\u63a8\u8350\u4f7f\u7528\u5b57\u9762\u91cf\u65b9\u5f0f\u58f0\u660e\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f Object \u6784\u9020\u51fd\u6570 \u200b<\/p>\n\n\n\n<\/figure>\n\n\n\n \u7b2c\u4e00\u79cd\u65b9\u6cd5<\/h4>\n\n\n\n1.Object.keys\n\u4f5c\u7528\uff1a Object.keys \u9759\u6001\u65b9\u6cd5\u83b7\u53d6 \u5bf9\u8c61\u4e2d\u6240\u6709\u5c5e\u6027\uff08\u952e\uff09\n\u8bed\u6cd5\uff1a\n <script>\n const o = { uname: 'pink', age: 18 }\n \/\/ 1.\u83b7\u5f97\u6240\u6709\u7684\u5c5e\u6027\u540d\n console.log(Object.keys(o)) \/\/\u8fd4\u56de\u6570\u7ec4['uname', 'age']\n <\/script>\n\u6ce8\u610f\uff1a \u8fd4\u56de\u7684\u662f\u4e00\u4e2a \u6570\u7ec4<\/code><\/pre>\n\n\n\n\u7b2c\u4e8c\u79cd\u65b9\u6cd5<\/h4>\n\n\n\n <script>\n const o = { uname: 'pink', age: 18 }\n \/\/ 2. \u83b7\u5f97\u6240\u6709\u7684\u5c5e\u6027\u503c\n console.log(Object.values(o)) \/\/ ['pink', 18]\n <\/script><\/code><\/pre>\n\n\n\n\u7b2c\u4e09\u79cd\u65b9\u6cd5<\/h4>\n\n\n\n <script>\n const o = { uname: 'pink', age: 18 }\n \/\/ 3. \u5bf9\u8c61\u7684\u62f7\u8d1d\n const oo = {}\n Object.assign(oo, o)\n console.log(oo)\n\n\n Object.assign(o, { gender: '\u5973' })\n console.log(o)\n <\/script><\/code><\/pre>\n\n\n\n<\/p>\n\n\n\n
reduce\u6570\u7ec4<\/h3>\n\n\n\n
\u4f5c\u7528\uff1a reduce \u8fd4\u56de\u51fd\u6570\u7d2f\u8ba1\u5904\u7406\u7684\u7ed3\u679c\uff0c\u7ecf\u5e38\u7528\u4e8e\u6c42\u548c\u7b49
\u57fa\u672c\u8bed\u6cd5\uff1aarr.reduce(function(\u7d2f\u8ba1\u503c, \u5f53\u524d\u5143\u7d20){}, \u8d77\u59cb\u503c)
\u53c2\u6570\uff1a \u8d77\u59cb\u503c\u53ef\u4ee5\u7701\u7565\uff0c\u5982\u679c\u5199\u5c31\u4f5c\u4e3a\u7b2c\u4e00\u6b21\u7d2f\u8ba1\u7684\u8d77\u59cb\u503c<\/p>\n\n\n\n
arr.reduce(function(){},\u8d77\u59cb\u503c)\n\n\/\/ 1. \u6ca1\u6709\u521d\u59cb\u503c\nconst total = arr.reduce(function (prev, current) {\n return prev + current \n})\n console.log(total)\n\n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c\uff08\u7b2c\u4e00\u6b21\u5faa\u574f\uff09\n 1 5 6\n \n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c \uff08\u7b2c\u4e8c\u6b21\u5faa\u574f\uff09\n 6 8 14\n\n\nconst arr = [1, 5, 8]\n\/\/ 2. \u6709\u521d\u59cb\u503c\nconst total = arr.reduce(function (prev, current) {\nreturn prev + current\n}, 10)\nconsole.log(total)\n \n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c\uff08\u7b2c\u4e00\u6b21\u5faa\u574f\uff09\n 10 1 11\n \n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c \uff08\u7b2c\u4e8c\u6b21\u5faa\u574f\uff09\n 11 5 16\n\n\/\/ \u4e0a\u4e00\u6b21\u503c \u5f53\u524d\u503c \u8fd4\u56de\u503c\uff08\u7b2c\u4e09\u6b21\u5faa\u574f\uff09\n 16 8 24<\/code><\/pre>\n\n\n\n\u8ba1\u7b97\u85aa\u8d44\u6848\u4f8b<\/h4>\n\n\n\nconst arr =[{\nname:'\u5f20\u4e09'\uff0c salary: 10000 },{\nname:'\u674e\u56db'\uff0c salary: 10000 },{\nname:'\u738b\u4e94'\uff0c salary: 10000 }]\n\/\/\u8ba1\u7b97\u85aa\u8d44\u6848\u4f8b\nconst total = arr. reduce((prev, current)=>{ \n\n\/\/ consoLe. Log(prev)\nreturn prev current. salary ), 0)\nconsole.log(total) \n\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c \u8fd4\u56de\u503c (\u7b2c\u4e00\u6b21\u904d\u5386) \n10000\n10000 \u2225\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c\n\u8fd4\u56de\u503c\uff08\u7b2c\u4e8c\u6b21\u904d\u5386\uff09 \/\/10000\n10000\n20000 \u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c\u8fd4\u56de\u503c\uff08\u7b2c\u4e09\u6b21\u904d\u5386\uff09 \/20000\n1000030000\n\/\/\u9700\u6c42\uff1a\u6bcf\u4e2a\u4eba\u6da8\u85aa30%\uff0c\u5f53\u6708\u652f\u51fa\u591a\u5c11\u85aa\u8d44\nconst total arr. reduce((prev, current) = prev current.salary 1.3, console.log(total)\n\u2225\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c \u8fd4\u56de\u503c\n(\u7b2c\u4e00\u6b21\u904d\u5386) \/\n13000\n13000 \/\u4e0a\u4e00\u6b21\u503c\n\u5f53\u524d\u503c \u8fd4\u56de\u503c\n(\u7b2c\u4e8c\u6b21\u904d\u5386) \/13000\n13000\n26000 \u2225\u4e0a\u6b21\u503c\n\u5f53\u524d\u503c\n\u8fd4\u56de\u503c\uff08\u7b2c\u4e09\u6b21\u904d\u5386\uff09 \/\/26000\n13000 39000 \n<\/code><\/pre>\n\n\n\narray<\/h3>\n\n\n\n<\/figure>\n\n\n\nconst arr =[\n{\nname:'\u5c0f\u7c73'\uff0c price: 1999 \n},\n{\nname:'\u534e\u4e3a'\uff0c\nprice: 3999\n},]\n\/\/\u627e\u5c0f\u7c73\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u5e76\u4e14\u8fd4\u56de\u8fd9\u4e2a\u5bf9\u8c61\/ \nconst mi arr. find(function (item){\n console. Log(item)\/\/\n consoLe. Log(item. name)\/\/ \nconsole. Log(111)\n return item.name==='\u534e\u4e3a'\n})\nconst mi = arr.find(item =>item.name =='\u5c0f\u7c73') \nconsole.log(mi)<\/code><\/pre>\n\n\n\nconst spec ={ size: '40cm*40cm', color:'\u9ed1\u8272'} \n\/\/1.\u6240\u6709\u7684\u5c5e\u6027\u503c\u56de\u53bb\u8fc7\u6765\u6570\u7ec4\n\/\/ console. Log(Object. values(spec)) \n\/\/2.\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32join\uff08'\/'\uff09\n\/\/ console. Log(Object. vaLues(spec). join('\/))\ndocument. querySelector('div'). innerHTML Object. values(spec). join('\/') <\/code><\/pre>\n\n\n\nstring<\/h3>\n\n\n\n
1.\u5b9e\u4f8b\u5c5e\u6027length\u7528\u6765\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u5ea6\u957f\uff08\u91cd\u70b9\uff091.\u5e38\u89c1\u5b9e\u4f8b\u65b9\u6cd5<\/p>\n\n\n\n
2.\u5b9e\u4f8b\u65b9\u6cd5split\uff08\u5206\u9694\u7b26'\uff09\u7528\u6765\u5c06\u5b57\u7b26\u4e32\u62c6\u5206\u6210\u6570\u7ec4\uff08\u91cd\u70b9\uff09<\/p>\n\n\n\n
3.\u5b9e\u4f8b\u65b9\u6cd5substring\uff08\u9700\u8981\u622a\u53d6\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u7684\u7d22\u5f15[\uff0c\u7ed3\u675f\u7684\u7d22\u5f15\u53f7]\uff09\u7528\u4e8e\u5b57\u7b26\u4e32\u622a\u53d6\uff08\u91cd\u70b9\uff09<\/p>\n\n\n\n
4.\u5b9e\u4f8b\u65b9\u6cd5startswith\uff08\u68c0\u6d4b\u5b57\u7b26\u4e32[\uff0c\u68c0\u6d4b\u4f4d\u7f6e\u7d22\u5f15\u53f7]\uff09\u68c0\u6d4b\u662f\u5426\u4ee5\u67d0\u5b57\u7b26\u5f00\u5934\uff08\u91cd\u70b9]<\/p>\n\n\n\n
5.\u5b9e\u4f8b\u65b9\u6cd5includes\uff08\u641c\u7d22\u7684\u5b57\u7b26\u4e32[\uff0c\u68c0\u6d4b\u4f4d\u7f6e\u7d22\u5f15\u53f7]\uff09\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5305\u542b\u5728\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\uff0c\u6839\u636e\u60c5\u51b5\u8fd4\u56detrue \u6216false(\u91cd\u70b9)<\/p>\n\n\n\n
6.\u5b9e\u4f8b\u65b9\u6cd5toUpperCase\u7528\u4e8e\u5c06\u5b57\u6bcd\u8f6c\u6362\u6210\u5927\u5199<\/p>\n\n\n\n
7.\u5b9e\u4f8b\u65b9\u6cd5toLowerCase\u7528\u4e8e\u5c06\u5c31\u8f6c\u6362\u6210\u5c0f\u5199<\/p>\n\n\n\n
8.\u5b9e\u4f8b\u65b9\u6cd5indexof\u68c0\u6d4b\u662f\u5426\u5305\u542b\u67d0\u5b57\u7b26<\/p>\n\n\n\n
9.\u5b9e\u4f8b\u65b9\u6cd5endswith\u68c0\u6d4b\u662f\u5426\u4ee5\u67d0\u5b57\u7b26\u7ed3\u5c3e<\/p>\n\n\n\n
10.\u5b9e\u4f8b\u65b9\u6cd5replace\u7528\u4e8e\u66ff\u6362\u5b57\u7b26\u4e32\uff0c\u652f\u6301\u6b63\u5219\u5339\u914d<\/p>\n\n\n\n
11.\u5b9e\u4f8b\u65b9\u6cd5match\u67e5\u627e\u5b57\u7b26\u4e32\uff0c\u652f\u6301\u6b63\u5219\u5339\u914d<\/p>\n\n\n\n
\u6e32\u67d3\u5546\u54c1\u6848\u4f8b<\/h3>\n\n\n\n<\/figure>\n\n\n\n\u6839\u636e\u4f60\u7684\u9700\u6c42\u6765\uff0cforeach\u662f\u9488\u5bf9\u4e8e\u6240\u6709\u7684\u6570\u636e\u904d\u5386\uff0cmap\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u4fee\u6539\u548c\u8fd4\u56de\uff0cfor\u5c31\u504f\u5411\u4e8e\u5927\u4f17\u5316\u4e00\u70b9 <\/p>\n\n\n\n
const gift='50g\u7684\u8336\u53f6\uff0c\u6e05\u6d17\u7403'\n\/\/1.\u628a\u5b57\u7b26\u4e32\u62c6\u5206\u4e3a\u6570\u7ec4\n\/\/ console. log(gift.split(','))[,]\n\/\/2.\u6839\u636e\u6570\u7ec4\u5143\u7d20\u7684\u4e2a\u6570\uff0c\u751f\u6210\u5bf9\u5e94span\u6807\u7b7e\n\/\/ const str gift. split(', ') map(function (item){ \nreturn `<span>\u3010\u54c1\u3011${ item}<\/span><br>`\n\/\/ ).join('')\n\/\/ consoLe. log(str)\n\/\/ document. querySeLector('div'). innerHTML=str\ndocument.querySelector('div').innerHTML=gift.split(',').map(item=`><span>\u3010\u8d60\u54c1\u3011${item}<\/ span><br>).join('')<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u542c\u4e86\u4ecb\u7ecd\u611f\u89c9\u5c31\u662f\u628ajs\u5728oop\u7684\u4f7f\u7528 \u4f5c\u7528\u57df \u4f5c\u7528\u57df\uff08scope\uff09\u89c4\u5b9a\u4e86\u53d8\u91cf\u80fd\u591f\u88ab\u8bbf\u95ee\u7684\u201c\u8303\u56f4\u201d\uff0c\u79bb\u5f00\u4e86\u8fd9\u4e2a\u201c\u8303\u56f4\u201d\u53d8\u91cf\u4fbf\u4e0d\u80fd\u88ab\u8bbf …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[2],"tags":[12,10],"class_list":["post-446","post","type-post","status-publish","format-standard","hentry","category-2","tag-js","tag-10"],"_links":{"self":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=446"}],"version-history":[{"count":0,"href":"https:\/\/eve2333.top\/index.php?rest_route=\/wp\/v2\/posts\/446\/revisions"}],"wp:attachment":[{"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eve2333.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}