{"id":409,"date":"2024-10-24T15:57:44","date_gmt":"2024-10-24T07:57:44","guid":{"rendered":"https:\/\/eve2333.top\/?p=409"},"modified":"2024-10-24T15:57:44","modified_gmt":"2024-10-24T07:57:44","slug":"javascript%e5%9f%ba%e7%a1%80%e8%af%ad%e6%b3%95%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=409","title":{"rendered":"Javascript\u57fa\u7840\u8bed\u6cd5\u5b66\u4e60"},"content":{"rendered":"\n

\u200bJavaScript \u662f\u4e00\u79cd\u811a\u672c\u7f16\u7a0b\u8bed\u8a00\uff0c\u5b83\u53ef\u4ee5\u5728\u7f51\u9875\u4e0a\u5b9e\u73b0\u590d\u6742\u7684\u529f\u80fd\uff0c\u7f51\u9875\u5c55\u73b0\u7ed9\u4f60\u7684\u4e0d\u518d\u662f\u7b80\u5355\u7684\u9759\u6001\u4fe1\u606f\uff0c\u800c\u662f\u5b9e\u65f6\u7684\u5185\u5bb9\u66f4\u65b0\u2014\u2014\u4ea4\u4e92\u5f0f\u7684\u5730\u56fe\u30012D\/3D \u52a8\u753b\u3001\u6eda\u52a8\u64ad\u653e\u7684\u89c6\u9891\u7b49\u7b49\u2014\u2014JavaScript \u5c31\u5728\u5176\u4e2d\u3002\u5b83\u662f\u6807\u51c6 Web \u6280\u672f\u86cb\u7cd5\u7684\u7b2c\u4e09\u5c42\uff0c\u5176\u4e2d\u00a0HTML<\/a>\u00a0\u548c\u00a0CSS<\/a>\u00a0\u6211\u4eec\u5df2\u7ecf\u5728\u5b66\u4e60\u533a\u7684\u5176\u4ed6\u90e8\u5206\u8fdb\u884c\u4e86\u8be6\u7ec6\u7684\u8bb2\u89e3\u3002<\/p>\n\n\n\n

PS:\u5176\u5b9e\u8fd9\u4e2a\u76f8\u5f53\u7684\u7b80\u5355,\u5e94\u5f53\u81ea\u884c\u5bfb\u627e\u4e00\u4e2a\u7b80\u5355\u7684\u5c0f\u9879\u76ee\u505a\u4e00\u505a\u5373\u53ef\u901a\u6653<\/strong><\/p>\n\n\n\n

<script>\n        alert('hello world')\n<\/script><\/code><\/pre>\n\n\n\n
\u6211\u4eec\u5c06\uff1cscript\uff1e\u653e\u5728HTML\u6587\u4ef6\u7684\u5e95\u90e8\u9644\u8fd1\u7684\u539f\u56e0\u662f\u6d4f\u89c8\u5668\u4f1a\u6309\u7167\u4ee3\u7801\u5728\u6587\u4ef6\u4e2d\u7684\u987a\u5e8f\u52a0\u8f7dHTML\u3002\u5982\u679c\u5148\u52a0\u8f7d\u7684JavaScript \u671f\u671b\u4fee\u6539\u5176\u4e0b\u65b9\u7684HTML\uff0c\u90a3\u4e48\u5b83\u53ef\u80fd\u7531\u4e8eHTML\u5c1a\u672a\u88ab\u52a0\u8f7d\u800c\u5931\u6548\u3002\u56e0\u6b64\uff0c\u5c06JavaScript\u4ee3\u7801\u653e\u5728HTML\u9875\u9762\u7684\u5e95\u90e8\u9644\u8fd1\u901a\u5e38\u662f\u6700\u597d\u7684\u7b56\u7565\u3002<\/p>\n\n\n\n
\u4ee3\u7801\u5199\u5728\u4ee5.js\u7ed3\u5c3e\u7684\u6587\u4ef6\u91cc \u901a\u8fc7script\u6807\u7b7e\uff0c\u5f15\u5165\u5230html\u9875\u9762\u4e2d\u3002<\/p>\n\n\n\n
<body>\n\n\uff1c\uff01\u2014\u2014 \u901a\u8fc7src\u5f15\u5165\u5916\u90e8js \u6587\u4ef6 \u2014\u2014\uff1e\n\n<script src=\"my.js\"><\/script> \n<\/body><\/code><\/pre>\n\n\n\n
\u6ce8\u610f\u4e8b\u9879<\/p>\n\n\n\n
1\uff0escript\u6807\u7b7e\u4e2d\u95f4\u65e0\u9700\u5199\u4ee3\u7801\uff0c\u5426\u5219\u4f1a\u88ab\u5ffd\u7565\uff01<\/p>\n\n\n\n
2\uff0e\u5916\u90e8avaScript\u4f1a\u4f7f\u4ee3\u7801\u66f4\u52a0\u6709\u5e8f\uff0c\u66f4\u6613\u4e8e\u590d\u7528\uff0c\u4e14\u6ca1\u6709\u4e86\u811a\u672c\u7684\u6df7\u5408\uff0cHTML\u4e5f\u4f1a\u66f4\u52a0\u6613\u8bfb\uff0c\u56e0\u6b64\u8fd9\u662f\u4e2a\u597d\u7684\u4e60\u60ef\u3002<\/p>\n\n\n\n
\u76ee\u6807\uff1a\u80fd\u5199\u51fa\u5e38\u89c1JavaScript\u8f93\u5165\u8f93\u51fa\u8bed\u6cd5<\/p>\n\n\n\n
\u8f93\u51fa\u548c\u8f93\u5165\u4e5f\u53ef\u7406\u89e3\u4e3a\u4eba\u548c\u8ba1\u7b97\u673a\u7684\u4ea4\u4e92\uff0c\u7528\u6237\u901a\u8fc7\u952e\u76d8\u3001\u9f20\u6807\u7b49\u5411\u8ba1\u7b97\u673a\u8f93\u5165\u4fe1\u606f\uff0c\u8ba1\u7b97\u673a\u5904\u7406\u540e\u518d\u5c55\u793a\u7ed3\u679c\u7ed9\u7528\u6237\uff0c\u8fd9\u4fbf\u662f\u4e00\u6b21\u8f93\u5165\u548c\u8f93\u51fa\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n
\u8f93\u51fa\u8bed\u6cd5\uff1a<\/h5>\n\n\n\n
\u8bed\u6cd51:document.write\uff08\uff07\u8981\u51fa\u7684\u5185\u5bb9\uff07\uff09\u4f5c\u7528\uff1a\u5411body\u5185\u8f93\u51fa\u5185\u5bb9 \u5982\u679c\u8f93\u51fa\u7684\u5185\u5bb9\u5199\u7684\u662f\u6807\u7b7e\uff0c\u4e5f\u4f1a\u88ab\u89e3\u6790\u6210\u7f51\u9875\u5143\u7d20<\/p>\n\n\n\n
\u8bed\u6cd52\uff1aalert\uff08\uff07\u8981\u51fa\u7684\u5185\u5bb9\uff07\uff09\u4f5c\u7528\uff1a\u9875\u9762\u5f39\u51fa\u8b66\u544a\u5bf9\u8bdd\u6846\u6ce8\u610f<\/p>\n\n\n\n
\u8bed\u6cd53\uff1aconsole.log\uff08\uff07\u63a7\u5236\u53f0\u6253\u5370\uff07\uff09 \u4f5c\u7528\uff1a\u63a7\u5236\u53f0\u8f93\u51fa\u8bed\u6cd5\uff0c\u7a0b\u5e8f\u5458\u8c03\u8bd5\u4f7f\u7528<\/p>\n\n\n\n
\u8f93\u5165\u8bed\u6cd5\uff1a<\/h5>\n\n\n\n
   prompt\uff08\u2018\u2019\uff09<\/p>\n\n\n\n
\u53d8\u91cf<\/h5>\n\n\n\n
    let age=18\uff0c<\/p>\n\n\n\n
\u53ef\u4ee5\u2018\u51e4\u51f0\u53e4\u57ce\u623f\u4ef7\u5f88\u9ad8\u2019+\u2018\u53cd\u5bf9\u5e7f\u6cdb\u5316\u5de5\u7b49\u7ea7\u5f88\u9ad8v\u5c31\u2019<\/p>\n\n\n\n
\u5f97\u5230\u5408\u5e76\u7684\u8bed\u53e5<\/p>\n\n\n\n
document.write\uff08\u201c\u6211\u4eca\u5e74\u2018+age+\u2019\u5c81\u4e86\u2018\uff09<\/p>\n\n\n\n
var\u58f0\u660e<\/h5>\n\n\n\n
\u6570\u7ec4<\/h5>\n\n\n\n
let arr=['10','20',30]<\/p>\n\n\n\n
const\u5e38\u91cf<\/h5>\n\n\n\n
\u5e38\u91cf\u58f0\u660e\u5fc5\u987b\u8d4b\u503c<\/p>\n\n\n\n
\u5f31\u6570\u636e\u7c7b\u578b\u8bed\u8a00js<\/p>\n\n\n\n
\u6a21\u677f\u5b57\u7b26\u4e32<\/h5>\n\n\n\n
\u8bed\u6cd5<\/p>\n\n\n\n
\u201d\uff08\u53cd\u5f15\u53f7\uff09\u5728\u82f1\u6587\u8f93\u5165\u6a21\u5f0f\u4e0b\u6309\u952e\u76d8\u7684tab\u952e\u4e0a\u65b9\u90a3\u4e2a\u952e\uff081\u5de6\u8fb9\u90a3\u4e2a\u952e\uff09\u5185\u5bb9\u62fc\u63a5\u53d8\u91cf\u65f6\uff0c\u7528\uff04\uff5b\uff5d\u5305\u4f4f\u53d8\u91cf<\/p>\n\n\n\n
document.write\uff08`\u5927\u5bb6\u597d\uff0c\u6211\u53eb\uff04\uff5bname\uff5d\uff0c\u4eca\u5e74\uff04\uff5bage\uff5d\u5c81 `\uff09<\/strong><\/p>\n\n\n\n
bool underfined null\u7b49\u7b49~<\/p>\n\n\n\n
undefined \u8868\u793a\u6ca1\u6709\u8d4b\u503c<\/p>\n\n\n\n
null\u8868\u793a\u8d4b\u503c\u4e86\uff0c\u4f46\u662f\u5185\u5bb9\u4e3a\u7a7a<\/p>\n\n\n\n
1\uff0e\u5e03\u5c14\u6570\u636e\u7c7b\u578b\u6709\u51e0\u4e2a\u503c\uff1f<\/p>\n\n\n\n
true\u548cfalse<\/p>\n\n\n\n
2\uff0e\u4ec0\u4e48\u65f6\u5019\u51fa\u73b0\u672a\u5b9a\u4e49\u6570\u636e\u7c7b\u578b\uff1f\u4ee5\u540e\u5f00\u53d1\u573a\u666f\u662f\uff1f<\/p>\n\n\n\n
\u5b9a\u4e49\u53d8\u91cf\u672a\u7ed9\u503c\u5c31\u662fundefined<\/p>\n\n\n\n
\u5982\u679c\u68c0\u6d4b\u53d8\u91cf\u662fundefined\u5c31\u8bf4\u660e\u6ca1\u6709\u503c\u4f20\u9012\u8fc7\u67653\uff0enull\u662f\u4ec0\u4e48\u7c7b\u578b\uff1f\u5f00\u53d1\u573a\u666f\u662f\uff1f<\/p>\n\n\n\n
\u7a7a\u7c7b\u578b<\/p>\n\n\n\n
\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u91cc\u9762\u786e\u5b9a\u5b58\u653e\u7684\u662f\u5bf9\u8c61\uff0c\u5982\u679c\u8fd8\u6ca1\u51c6\u5907\u597d\u5bf9\u8c61\uff0c\u53ef\u4ee5\u653e\u4e2anull<\/p>\n\n\n\n
typeof x<\/p>\n\n\n\n
\u7c7b\u578b\u8f6c\u6362<\/h5>\n\n\n\n
JavaScript\u662f\u5f31\u6570\u636e\u7c7b\u578b\uff1aJavaScript\u4e5f\u4e0d\u77e5\u9053\u53d8\u91cf\u5230\u5e95\u5c5e\u4e8e\u90a3\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u53ea\u6709\u8d4b\u503c\u4e86\u624d\u6e05\u695a\u3002<\/p>\n\n\n\n
\u5751\uff1a\u4f7f\u7528\u8868\u5355\u3001prompt \u83b7\u53d6\u8fc7\u6765\u7684\u6570\u636e\u9ed8\u8ba4\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\uff0c\u6b64\u65f6\u5c31\u4e0d\u80fd\u76f4\u63a5\u7b80\u5355\u7684\u8fdb\u884c\u52a0\u6cd5\u8fd0\u7b97\u3002console\uff0elog\uff08\uff0710000\uff07 \uff0b\uff072000\uff07\uff09\uff0f\uff0f\u8f93\u51fa\u7ed3\u679c100002000<\/p>\n\n\n\n
\u9690\u5f0f\u8f6c\u6362<\/h5>\n\n\n\n
\u67d0\u4e9b\u8fd0\u7b97\u7b26\u88ab\u6267\u884c\u65f6\uff0c\u7cfb\u7edf\u5185\u90e8\u81ea\u52a8\u5c06\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u8f6c\u6362\uff0c\u8fd9\u79cd\u8f6c\u6362\u79f0\u4e3a\u9690\u5f0f\u8f6c\u6362\u3002\u89c4\u5219\uff1a<\/p>\n\n\n\n
\uff0b\u53f7\u4e24\u8fb9\u53ea\u8981\u6709\u4e00\u4e2a\u662f\u5b57\u7b26\u4e32\uff0c\u90fd\u4f1a\u628a\u53e6\u5916\u4e00\u4e2a\u8f6c\u6210\u5b57\u7b26\u4e32<\/p>\n\n\n\n
\u9664\u4e86\uff0b\u4ee5\u5916\u7684\u7b97\u672f\u8fd0\u7b97\u7b26 \u6bd4\u5982\u2014\uff0a\uff0f\u7b49\u90fd\u4f1a\u628a\u6570\u636e\u8f6c\u6210\u6570\u5b57\u7c7b\u578b\u7f3a\u70b9\uff1a<\/p>\n\n\n\n
\u8f6c\u6362\u7c7b\u578b\u4e0d\u660e\u786e\uff0c\u9760\u7ecf\u9a8c\u624d\u80fd\u603b\u7ed3\u5c0f\u6280\u5de7\uff1a<\/p>\n\n\n\n
\uff0b\u53f7\u4f5c\u4e3a\u6b63\u53f7\u89e3\u6790\u53ef\u4ee5\u8f6c\u6362\u6210\u6570\u5b57\u578b\u4efb\u4f55\u6570\u636e\u548c\u5b57\u7b26\u4e32\u76f8\u52a0\u7ed3\u679c\u90fd\u662f\u5b57\u7b26\u4e32<\/p>\n\n\n\n
\u663e\u5f0f\u8f6c\u6362<\/h5>\n\n\n\n
\u8f6c\u6362\u4e3a\u6570\u5b57\u578b<\/p>\n\n\n\n
Number\uff08\u6570\u636e\uff09 \u8f6c\u6210\u6570\u5b57\u7c7b\u578b<\/p>\n\n\n\n
\u5982\u679c\u5b57\u7b26\u4e32\u5185\u5bb9\u91cc\u6709\u975e\u6570\u5b57\uff0c\u8f6c\u6362\u5931\u8d25\u65f6\u7ed3\u679c\u4e3aNaN\uff08Not a Number\uff09\u5373\u4e0d\u662f\u4e00\u4e2a\u6570\u5b57NaN\u4e5f\u662fnumber\u7c7b\u578b\u7684\u6570\u636e\uff0c\u4ee3\u8868\u975e\u6570\u5b57<\/p>\n\n\n\n
parselnt\uff08\u6570\u636e\uff09 \u53ea\u4fdd\u7559\u6574\u6570 parseFloat\uff08\u6570\u636e\uff09 \u53ef\u4ee5\u4fdd\u7559\u5c0f\u6570<\/p>\n\n\n\n
let str = '123'\n\nconsole.log(Number(str))\nconsole.log(Number('pink'))\n\n\/\/ Let num\uff1dNumber\uff08prompt\uff08\uff07\u8f93\u5165\u5e74\u85aa\uff07\uff09\uff09 \n\/\/ Let num \uff1d \uff0bprompt\uff08\uff07\u8f93\u5165\u5e74\u85aa\uff07\uff09\n\n\/\/ console.Log(Number(num))\n\n\/\/ console.Log(num)\n\nconsole.log(parseInt('12px')) \nconsole.log(parseInt('12.34px')) \nconsole.log(parseInt('12.94px')) \nconsole.log(parseInt('abc12.94px'))\n\nconsole.log(parseFloat('12px')) \/\/ 12 \nconsole.1og(parseFloat('12.34px'))\/\/ 12.34 \nconsole.log(parseFloat('12.94px')) \/\/ 12.94\nconsole.log(parseFloat('abc12.94px')) \/\/ 12.94\n<\/code><\/pre>\n\n\n\n
 \u4e0b\u9762\u53ef\u80fd\u51fa\u73b0\u4ec0\u4e48\u95ee\u9898\uff1f\u5982\u4f55\u89e3\u51b3
 letnum1=prompt\uff08\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\u503c\uff1a\uff09
 letnum2=prompt\uff08\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\u503c\uff1a\uff09
 alert\uff08`\u4e24\u8005\u76f8\u52a0\u7684\u7ed3\u679c\u662f\uff1a$num1+num2}`\uff09
\u5206\u6790\uff1a
   \u56e0\u4e3aprompt\u83b7\u53d6\u8fc7\u6765\u7684\u662f\u5b57\u7b26\u578b\uff0c\u6240\u4ee5\u4f1a\u51fa\u73b0\u5b57\u7b26\u76f8\u52a0\u7684\u95ee\u9898prompt\u5982\u679c\u51fa\u73b0\u76f8\u52a0\u8bb0\u5f97\u8981\u8f6c\u4e3a\u6570\u5b57\u578b\uff0c\u53ef\u4ee5\u5229\u7528+\u6700\u7b80\u5355letnum1=+prompt\uff08\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\u503c\uff1a\uff09
 letnum2=prompt\uff08\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\u503c\uff1a\uff09
 alert\uff08`\u4e24\u8005\u76f8\u52a0\u7684\u7ed3\u679c\u662f\uff1anum1+num2}`\uff09<\/p>\n\n\n\n
<script>\nlet price = +prompt\uff08'\u9756\u8f93\u5165\u5546\u54c1\u4ef7\u683c\uff1a'\uff09\nlet num = +prompt\uff08'\u8bf7\u8f93\u5165\u5546\u54c1\u6570\u4fdd:'\uff09\nlet address = prompt\uff08'\u8bf7\u8f93\u5165\u6536\u83b7\u5730\u5740\uff1a'\uff09\n\/\/ 2.\u8ba1\u7b97\u603b\u989d\nlet total = price * num\n\/\/ 3.\u9875\u9762\u6253\u5370\u6e32\u67d3\ndocument.write(`\n<table>\n<tr>\n<th>\u5546\u54c1\u540d\u79f0\"th>\n<th>\u5546\u54c1\u4ef7\u683c\" th\uff09\n<th>\u5546\u54c1\u6570\u91cf<\/th>\n<th> \u603b\u4ef7 <\/th>\n\uff08th>\u6536\u8d27\u5730\u5740<\/th>\n<\/tr>\n<tr>\n<td>\u5c0f\u7c73\u9752\u6625\u7248PLUS<\/td>\n<td>${price}\u5143<\/td>\n<td>${num}<\/td>\n<td>${total}\u5143\u3003td>\n<td>${address}<\/td>\n<\/tr>\n<\/table>\n`)\n<\/script><\/code><\/pre>\n\n\n\n
\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h5>\n\n\n\n
+=                     -=                                    \/=                        *=                        =<\/p>\n\n\n\n
\u4e00\u5143\u8fd0\u7b97\u7b26<\/h5>\n\n\n\n
\u6b63\u8d1f\u53f7 \u81ea\u589e<\/p>\n\n\n\n
let i=1\nconsole.log(i++ + ++i +i)\n\/\/\u7b54\u6848\u4e3a7<\/code><\/pre>\n\n\n\n
\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h5>\n\n\n\n
NaN\u4e0d\u7b49\u4e8e\u4efb\u4f55\uff0c\u5305\u62ec\u4ed6\u81ea\u5df1<\/p>\n\n\n\n
\u4ed6\u6709\u9690\u5f0f\u8f6c\u6362\u20192\u2018\u53ef\u4ee5\u53d8\u62102<\/p>\n\n\n\n
\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff1a
> \uff1a \u5de6\u8fb9\u662f\u5426\u5927\u4e8e\u53f3\u8fb9
<\uff1a \u5de6\u8fb9\u662f\u5426\u5c0f\u4e8e\u53f3\u8fb9
>=\uff1a\u5de6\u8fb9\u662f\u5426\u5927\u4e8e\u6216\u7b49\u4e8e\u53f3\u8fb9
<=\uff1a\u5de6\u8fb9\u662f\u5426\u5c0f\u4e8e\u6216\u7b49\u4e8e\u53f3\u8fb9
==\uff1a\u5de6\u53f3\u4e24\u8fb9\u503c\u662f\u5426\u76f8\u7b49
===\uff1a\u5de6\u53f3\u4e24\u8fb9\u662f\u5426\u7c7b\u578b\u548c\u503c\u90fd\u76f8\u7b49
!==\uff1a\u5de6\u53f3\u4e24\u8fb9\u662f\u5426\u4e0d\u5168\u7b49
\u6bd4\u8f83\u7ed3\u679c\u4e3aboolean\u7c7b\u578b\uff0c\u5373\u53ea\u4f1a\u5f97\u5230true\u6216false
\u5bf9\u6bd4
=\u5355\u7b49\u662f\u8d4b\u503c
==\u662f\u5224\u65ad
===\u662f\u5168\u7b49
\u5f00\u53d1\u4e2d\u5224\u65ad\u662f\u5426\u76f8\u7b49\uff0c\u5f3a\u70c8\u63a8\u8350\u4f7f\u7528 ===<\/p>\n\n\n\n
<script>\n    console.log(3 > 5)\n    console.log(3 >= 3)\n    console.log(2 == 2)\n    \/\/\u6bd4\u8f83\u8fd0\u7b97\u7b26\u6709\u9690\u5f0f\u8f6c\u6362\u628a'2'\u8f6c\u6362\u4e3a2\u53cc\u7b49\u53f7\u53ea\u5224\u65ad\u503c\n    console.log(2 == '2') \/\/ true\n    \/\/ console.Log(undefined === nuHL)\n    \/\/ ===\u5168\u7b49\u5224\u65ad\u503c\u548c\u6570\u636e\u7c7b\u578b\u90fd\u4e00\u6837\u624d\u884c\n    \/\/\u4ee5\u7528\u5b32\u5ba0\u5426\u6307\u7b49\u8bf7\u7528===(\n    console.log(2 === '2')\n    console. log(NaN === NaN) \/\/ NaN 4\u3001F } ff \u4f55\u4eba.6Mt\u80b2\u5df1\n    console.log(2 !== '2') \/\/ true\n    console.log(2 != '2') \/\/ faLse\n    console. log('---------------------------')\n    console.log('a' < 'b') \/\/ true\n    console.log('aa' < 'ab') \/\/ true\n    console.log('aa' < 'aac') \/\/ true\n    console. log('---------------------------')\n<\/script><\/code><\/pre>\n\n\n\n
\u903b\u8f91\u8fd0\u7b97\u7b26<\/h5>\n\n\n\n
&&    ||      !<\/p>\n\n\n\n
\u4f18\u5148\u7ea7<\/td>\u8fd0\u7b97\u7b26<\/td>\u5e8f<\/td><\/tr>
1<\/td>\u5c0f\u62ec\u53f7<\/td>\uff08\uff09<\/td><\/tr>
2<\/td>\u4e00\u5143\u8fd0\u7b97\u7b26<\/td>i - !<\/td><\/tr>
3<\/td>\u7b97\u6570\u8fd0\u7b97\u7b26<\/td>\u5148*\/%\u540e+-<\/td><\/tr>
4<\/td>\u5173\u7cfb\u8fd0\u7b97\u7b26<\/td>> >= < <=<\/td><\/tr>
5<\/td>\u76f8\u7b49\u8fd0U\u7b26<\/td>== != === !==<\/td><\/tr>
6<\/td>luo\u8f91\u8fd0\u7b97\u7b26<\/td>\u5148&&\u540eII<\/td><\/tr>
7<\/td>\u914d\u503c\u8fd0\u7b97\u7b26<\/td>=<\/td><\/tr>
8<\/td>\u9017\u53f7\u8fd0\u7b97\u7b26<\/td>\uff0c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u2022 \u4e00\u5143\u8fd0\u7b97\u7b26\u91cc\u9762\u7684\u903b\u8f91\u975e\u4f18\u5148\u7ea7\u5f88\u9ad8
\u2022\u903b\u8f91\u4e0e\u6bd4\u903b\u8f91\u6216\u4f18\u5148\u7ea7\u9ad8<\/p>\n\n\n\n
\u533a\u522b\uff1a<\/h5>\n\n\n\n
\u8868\u8fbe\u5f0f\uff1a\u56e0\u4e3a\u8868\u8fbe\u5f0f\u53ef\u88ab\u6c42\u503c\uff0c\u6240\u4ee5\u5b83\u53ef\u4ee5\u5199\u5728\u8d4b\u503c\u8bed\u53e5\u7684\u53f3\u4fa7\u3002
\uff1e\u8868\u8fbe\u5f0f num = 3 + 4
\u8bed\u53e5\uff1a\u800c\u8bed\u53e5\u4e0d\u4e00\u5b9a\u6709\u503c\uff0c\u6240\u4ee5\u6bd4\u5982alert\u3002for\u548cbreak\u7b49\u8bed\u53e5\u5c31\u4e0d\u80fd\u88ab\u7528\u4e8e\u8d4b\u503c\u3002
\uff1e\u8bed\u53e5 alert()\u5f39\u51fa\u5bf9\u8bdd\u6846console.log()\u63a7\u5236\u53f0\u6253\u5370\u8f93\u51fa<\/p>\n\n\n\n
\u5224\u65ad<\/h5>\n\n\n\n
if(){}<\/p>\n\n\n\n
else{}<\/p>\n\n\n\n
else if(){}<\/p>\n\n\n\n
\u6761\u4ef6?\u6ee1\u8db3\u7684\u4ee3\u7801:\u4e0d\u6ee1\u8db3\u7684\u4ee3\u7801<\/p>\n\n\n\n
switch\uff08\uff09{<\/p>\n\n\n\n
case   \uff1a  break<\/p>\n\n\n\n
case   \uff1a  break<\/p>\n\n\n\n
default\uff1a  break<\/p>\n\n\n\n
} \u200b<\/p>\n\n\n\n
 js\u5927\u90e8\u5206\u548cc\u5f88\u50cf\uff0c\u56e0\u6b64\u4e0d\u518d\u591a\u53d9\u8ff0<\/p>\n\n\n\n
\u5faa\u73af<\/h2>\n\n\n\n
while(ture){}<\/p>\n\n\n\n
for\uff08 \uff1b\uff1b\uff09{}<\/p>\n\n\n\n
let arr=[]<\/p>\n\n\n\n
let arr={1,1,1,1,1,2,9,3,6,5}<\/p>\n\n\n\n
<script>\n\nlet arr=[2,6,1,7,4] \n\n\/\/ 1\uff0e\u6c42\u548c\u7684\u53d8\u91cf sum\n\nlet sum = 0 \n\n\/\/2\uff0e\u904d\u5386\u7d2f\u52a0\n\nfor (let i =0; i < arr.length; i++) {\n\n\/\/ console.Log(arr[i])\n\n\/\/ sum = sum +arr[i] \n\nsum+=arr[i]\n\n}\n\nconsole.log\uff08`\u6570\u7ec4\u7684\u548c\u7684\u7ed3\u679c\u662f\uff1a\uff04\uff5bsum\uff5d`\uff09\n\n\/\/3\uff0e\u5e73\u5747\u503c \u548c\uff0farr\uff0eLength\uff1d4\n\nconsole.log\uff08`\u6570\u7ec4\u7684\u5e73\u5747\u503c\u7ed3\u679c\u662f\uff1a\uff04\uff5bsum\uff0f arr.length\uff5d`\uff09\n\n\/\/ sum = sum + arr[\u03b8]\n\n\/\/console.Log(sum) \n\n<\/script><\/code><\/pre>\n\n\n\n
\u589e\u5220\u6539\u67e5\u6570\u7ec4<\/p>\n\n\n\n
arr.push( , , )\u6570\u7ec4\u672b\u5c3e<\/p>\n\n\n\n
arr.unshift(\uff0c\uff0c)\u6570\u7ec4\u524d\u9762<\/p>\n\n\n\n
let arr=['pink','hotpink']\nconsole.log(arr.push('pinkdeep','skyblue'))\nconsole.log(arr)<\/code><\/pre>\n\n\n\n
arr.pop()\u4ece\u6570\u7ec4\u5220\u9664\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u8fd4\u56de\u8be5\u5143\u7d20\u7684\u503c<\/p>\n\n\n\n
arr.shift()\u4ece\u6570\u7ec4\u5220\u9664\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c<\/p>\n\n\n\n
arr.splice(start,deletecount)\u4ece\u6307\u5b9a\u7684\u4f4d\u7f6e\u5220\u9664\u51e0\u4e2a <\/p>\n\n\n\n
\u6e32\u67d3\u67f1\u5f62\u56fe\u6848<\/strong><\/p>\n\n\n\n
<!DOCTYPE html>\n<html lang=\"en\">\n \n<head>\n    <meta charset=\"UTF-8\">\n    <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>\n    <style>\n        * {\n            margin: 0;\n            padding: 0;\n        }\n \n        .box {\n            \/\/\u8bbe\u7f6e\u88c5\u67f1\u5f62\u56fe\u7684\u76d2\u5b50\u4ee5\u53ca\u5de6\u8fb9\u6846\u548c\u4e0b\u8fb9\u6846\n            display: flex;\n            width: 700px;\n            height: 300px;\n            border-left: 1px solid pink;\n            border-bottom: 1px solid pink;\n            margin: 50px auto;\n            justify-content: space-around;\n            align-items: flex-end;\n            text-align: center;\n        }\n \n        .box>div {\n            \/\/\u8bbe\u7f6e\u67f1\u5f62\u6761\n            display: flex;\n            width: 50px;\n            background-color: pink;\n            flex-direction: column;\n            justify-content: space-between;\n        }\n \n        .box div span {\n            \/\/\u8ba9\u67f1\u5f62\u56fe\u4e0a\u9762\u7684\u6570\u5b57\u4e0a\u79fb\n            margin-top: -20px;\n        }\n \n        .box div h4 {\n            \/\/\u8ba9\u67f1\u5f62\u56fe\u4e0b\u65b9\u7684\u8bf4\u660e\u6587\u5b57\u4e0b\u79fb\u3001\u5de6\u79fb\uff0c\u8bbe\u7f6e\u5bbd\u5ea6\n            margin-bottom: -35px;\n            width: 70px;\n            margin-left: -10px;\n        }\n    <\/style>\n<\/head>\n \n<body>\n    <script>\n        \/\/ 1. \u56db\u6b21\u5f39\u6846\u6548\u679c\n        \/\/ \u58f0\u660e\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\n        let arr = []\n        for (let i = 1; i <= 4; i++) {\n            \/\/ let num = prompt(`\u8bf7\u8f93\u5165\u7b2c${i}\u5b63\u5ea6\u7684\u6570\u636e:`)\n            \/\/ arr.push(num)\n            arr.push(prompt(`\u8bf7\u8f93\u5165\u7b2c${i}\u5b63\u5ea6\u7684\u6570\u636e:`))\n            \/\/ push\u8bb0\u5f97\u52a0\u5c0f\u62ec\u53f7\uff0c\u4e0d\u662f\u7b49\u53f7\u8d4b\u503c\u7684\u5f62\u5f0f\n        }\n        \/\/ console.log(arr)  ['123','135','345','234']\n        \/\/ \u76d2\u5b50\u5f00\u5934\n        document.write(` <div class=\"box\">`)\n \n        \/\/ \u76d2\u5b50\u4e2d\u95f4 \u5229\u7528\u5faa\u73af\u7684\u5f62\u5f0f  \u8ddf\u6570\u7ec4\u6709\u5173\u7cfb\n        for (let i = 0; i < arr.length; i++) {\n            document.write(`\n              <div style=\"height: ${arr[i]}px;\">\n                <span>${arr[i]}<\/span>\n                <h4>\u7b2c${i + 1}\u5b63\u5ea6<\/h4>\n              <\/div>          \n            `)\n        }\n        \/\/ \u76d2\u5b50\u7ed3\u5c3e\n        document.write(` <\/div>`)\n    <\/script>\n<\/body>\n \n<\/html><\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
arr.sort(function(a,b){\n\nreturn a-b\n\n})\/\/\u5347\u5e8f\n\narr.sort(function(a,b){\n\nreturn b-a\n\n})\/\/\u964d\u5e8f<\/code><\/pre>\n\n\n\n
\u51fd\u6570<\/h2>\n\n\n\n
<script>\nfunction sheet99(){\nfor(let i=1;i <= 9; i++) { \n\/\/ 2\uff0e\u91cc\u5c42\u5faa\u73af\u63a7\u5236\u5217\u6570\nfor \uff08let j=1;j<=i;j++){\ndocument.write(`<span>${j} x ${i} = ${i * j}<\/span>`) \n}\n\/\/ \u6362\u884c\ndocument.write('<br>') \n}\n}\n\/\/\u8c03\u7528 \nsheet99() \nshept99() \nsheet99() \nsheet99() \n<\/script> <\/code><\/pre>\n\n\n\n
<script>\n\n\/\/1\uff0e\u6c422\u4e2a\u6570\u7684\u548c\n\n\/\/ function getSum() { \n\n\nLet num1 \uff1d \uff0bprompt\uff08\uff07\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570\uff07\uff09 \/\/\n\nLet num2 \uff1d \uff0bprompt\uff08\uff07\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570\uff07\uff09 \/\/\n\nconsole.Log(num1 + num2) { \/\/\n\n\/\/ getSum()\n\n\uff0f\uff0f 2\uff0e\u6c421\uff5e100 \u7d2f\u52a0\u548cIfunction getSum(){ let sum=0\n\nfor (let i = 1; i <= 100;i++) { sum +=i\n\n}\n\nconsole.log(sum) getSum()\n\n<\/script> <\/code><\/pre>\n\n\n\n
 \u6b7b\u51fd\u6570\uff0c\u4e0b\u9762\u662f\u5e26\u53c2\u6570\u7684\u51fd\u6570<\/p>\n\n\n\n
function getSum(start, end) { \n\n\/\/ end = 50 \n\n\/\/console.Log(end)\n\nlet sum = 0\n\nfor (let i = start; i <= end; i++) {\n\nsum += i\n\n}\n\nconsole.log(sum)\n\n}\n\ngetSum(1,50) \n\n\/\/ getSum(100) <\/code><\/pre>\n\n\n\n
\u5f62\u53c2\uff1a\u58f0\u660e\u51fd\u6570\u65f6\u5199\u5728\u51fd\u6570\u540d\u53f3\u8fb9\u5c0f\u62ec\u53f7\u91cc\u7684\u53eb\u5f62\u53c2\uff08\u5f62\u5f0f\u4e0a\u7684\u53c2\u6570\uff09<\/p>\n\n\n\n
\u5b9e\u53c2\uff1a\u8c03\u7528\u51fd\u6570\u65f6\u5199\u5728\u51fd\u6570\u540d\u53f3\u8fb9\u5c0f\u62ec\u53f7\u91cc\u7684\u53eb\u5b9e\u53c2\uff08\u5b9e\u9645\u4e0a\u7684\u53c2\u6570\uff09<\/p>\n\n\n\n
\u5f62\u53c2\u53ef\u4ee5\u7406\u89e3\u4e3a\u662f\u5728\u8fd9\u4e2a\u51fd\u6570\u5185\u58f0\u660e\u7684\u53d8\u91cf\uff08\u6bd4\u5982num1\uff1d10\uff09\u5b9e\u53c2\u53ef\u4ee5\u7406\u89e3\u4e3a\u662f\u7ed9\u8fd9\u4e2a\u53d8\u91cf\u8d4b\u503c\u5f00\u53d1\u4e2d\u5c3d\u91cf\u4fdd\u6301\u5f62\u53c2\u548c\u5b9e\u53c2\u4e2a\u6570\u4e00\u81f4<\/p>\n\n\n\n
\u6211\u4eec\u66fe\u7ecf\u4f7f\u7528\u8fc7\u7684 alert\uff08\uff07\u6253\u5370\uff07\uff09\uff0c parselnt\uff08\uff0711\uff07\uff09\uff0c Number\uff08\uff0711\uff07\uff09\u672c\u8d28\u4e0a\u90fd\u662f\u51fd\u6570\u8c03\u7528\u7684\u4f20\u53c2<\/p>\n\n\n\n
\u5f62\u53c2\uff1a\u53ef\u4ee5\u770b\u505a\u53d8\u91cf\uff0c\u4f46\u662f\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u4e0d\u7ed9\u503c\uff0c\u9ed8\u8ba4\u662f\u4ec0\u4e48\uff1f
>undefined
\u4f46\u662f\u5982\u679c\u505a\u7528\u6237\u4e0d\u8f93\u5165\u5b9e\u53c2\uff0c\u521a\u624d\u7684\u6848\u4f8b\uff0c\u5219\u51fa\u73b0undefined+undefined\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f
>NaN
\u6211\u4eec\u53ef\u4ee5\u6539\u8fdb\u4e0b\uff0c\u7528\u6237\u4e0d\u8f93\u5165\u5b9e\u53c2\uff0c\u53ef\u4ee5\u7ed9\u5f62\u53c2\u9ed8\u8ba4\u503c\uff0c\u53ef\u4ee5\u9ed8\u8ba4\u4e3a0\uff0c\u8fd9\u6837\u7a0b\u5e8f\u66f4\u4e25\u8c28\uff0c\u53ef\u4ee5\u5982\u4e0b\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
function getSum(x = 0, y = 0) {\ndocument. write(x + y)\n}\n\ngetSum()\/\/\u7ed3\u679c\u662f0\uff0c\u800c\u4e0d\u662fN\ngetSum(1,2)\/\/\u7ed3\u679c\u662f 3<\/code><\/pre>\n\n\n\n
\u8bf4\u660e\uff1a\u8fd9\u4e2a\u9ed8\u8ba4\u503c\u53ea\u4f1a\u5728\u7f3a\u5c11\u5b9e\u53c2\u53c2\u6570\u4f20\u9012\u65f6\u624d\u4f1a\u88ab\u6267\u884c\uff0c\u6240\u4ee5\u6709\u53c2\u6570\u4f1a\u4f18\u5148\u6267\u884c\u4f20\u9012\u8fc7\u6765\u7684\u5b9e\u53c2\uff0c\u5426\u5219\u9ed8\u8ba4\u4e3aundefined<\/p>\n\n\n\n
<body>\n<script>\n\/\/ \u5c01\u88c5\u51fd\u6570\n\/\/\u7ed9\u4e00\u4e2a\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\nfunction getArrSum(arr = []) {\n\/\/ consoLe.Log(arr)\nlet sum = 0\nfor (let i = 0; i < arr.length; i++) {\nsum += arr[i]\n}\nconsole.log(sum)\n}\ngetArrSum([1, 2, 3, 4, 5])\ngetArrSum([11, 22, 33])\ngetArrSum() \/\/ 0\n<\/script>\n<\/body><\/code><\/pre>\n\n\n\n
\u8fd4\u56de\u503c\u00a0  \u00a0return dfs<\/p>\n\n\n\n
    \n
  • \u5728\u51fd\u6570\u4f53\u4e2d\u4f7f\u7528return\u5173\u952e\u5b57\u80fd\u5c06\u5185\u90e8\u7684\u6267\u884c\u7ed3\u679c\u4ea4\u7ed9\u51fd\u6570\u5916\u90e8\u4f7f\u7528<\/li>\n\n\n\n
  • return\u540e\u9762\u4ee3\u7801\u4e0d\u4f1a\u518d\u88ab\u6267\u884c\uff0c\u4f1a\u7acb\u5373\u7ed3\u675f\u5f53\u524d\u51fd\u6570\uff0c\u6240\u4ee5return\u540e\u9762\u7684\u6570\u636e\u4e0d\u8981\u6362\u884c\u5199<\/li>\n\n\n\n
  • return\u51fd\u6570\u53ef\u4ee5\u6ca1\u6709return,\u8fd9\u79cd\u60c5\u51b5\u51fd\u6570\u9ed8\u8ba4\u8fd4\u56de\u503c\u4e3aundefined<\/li>\n<\/ul>\n\n\n\n
      \u8fd4\u56de\u51fd\u6570\u591a\u4e2a\u6570\u5b57:return[max,min]<\/p>\n\n\n\n
    \u2022 \u4e24\u4e2a\u76f8\u540c\u7684\u51fd\u6570\u540e\u9762\u7684\u4f1a\u8986\u76d6\u524d\u9762\u7684\u51fd\u6570
    \u2022 \u5728Javascript\u4e2d\u5b9e\u53c2\u7684\u4e2a\u6570\u548c\u5f62\u53c2\u7684\u4e2a\u9730\u53ef\u4ee5\u4e0d\u4e00\u81f4
            1.\u5982\u679c\u5f62\u53c2\u8fc7\u591a\u4f1a\u81ea\u52a8\u586b\u4e0aundefined \uff08\u4e86\u89e3\u5373\u53ef\uff09
            2.\u5982\u679c\u5b9e\u53c2\u8fc7\u591a\u90a3\u4e48\u591a\u4f59\u7684\u5b9e\u53c2\u4f1a\u88ab\u5ffd\u7565\uff08\u51fd\u6570\u5185\u90e8\u6709\u4e00\u4e2aarguments,\u91cc\u9762\u88c5\u7740\u6240\u6709\u7684\u5b9e\u53c2\uff09
    \u2022 \u51fd\u6570\u4e00\u65e6\u78b0\u5230return\u5c31\u4e0d\u4f1a\u5728\u5f80\u4e0b\u6267\u884c\u4e86\u51fd\u6570\u7684\u7ed3\u675f\u7528return<\/p>\n\n\n\n
    \u4f5c\u7528\u57df<\/h3>\n\n\n\n
    \u5168\u5c40\u4f5c\u7528\u57df\u548c\u5c40\u90e8\u4f5c\u7528\u57df<\/p>\n\n\n\n
    \u6574\u4e2aJS\u6587\u4ef6\u5c31\u662f\u5168\u5c40<\/p>\n\n\n\n
    \u51fd\u6570\u7684\u53d8\u91cf\u662f\u5c40\u90e8<\/p>\n\n\n\n
    \u5c40\u90e8\u53d8\u91cf\u6216\u8005\u5757\u7ea7\u53d8\u91cf\uff0c\u6ca1\u6709let\u58f0\u660e\u7684\u76f4\u63a5\u8d4b\u503c\u5f53\u5168\u5c40\u53d8\u91cf\u770b<\/p>\n\n\n\n
    \u5728\u80fd\u8bbf\u95ee\u5230\u7684\u524d\u63d0\uff0c\u5148\u5c40\u90e8\uff0c\u5c40\u90e8\u6ca1\u6709\u627e\u5168\u5c40<\/strong><\/p>\n\n\n\n
    \u533f\u540d\u51fd\u6570<\/h3>\n\n\n\n
    \u5728API\u90e8\u5206\u8fdb\u4e00\u6b65\u6df1\u5316<\/p>\n\n\n\n
    \u7acb\u5373\u6267\u884c\u51fd\u6570<\/h4>\n\n\n\n
    <script>\n\/\/let num = 10\n\/\/let num 20\n\/\/(function (){\n\/\/ console.log(11)\n\/\/})()\n(function(){})()\n\n\n(function(x,y){\nconsole.log(x+y)\n})(1,2)\n\n\n\/\/1.\u7b2c\u4e00\u79cd\u5199\u6cd5\n(function (x, y) {\nconsole.log(x + y)\nlet num = 10\nlet arr = []\n})(1,2);\n\/\/(function(){})();\n\/\/2.\u7b2c\u4e8c\u79cd\u5199\u6cd5\n1\/(function ({}());\n(function (x, y) {\nlet arr = []\nconsole. log(x + y)\n}(1,3));\n\/\/(function(){})()\n\/\/(function(){}())\n<\/script><\/code><\/pre>\n\n\n\n
    \u7b80\u5355\u6848\u4f8b\uff1a\u8f93\u5165\u79d2\u6570\uff0c\u8f6c\u6362\u4e3a\u65f6\u5206\u79d2<\/p>\n\n\n\n
    <script>\nage = age + 1\n\/\/ L\u7528\u6237\u8f93\u5165\nlet second = +prompt('\u8bf7\u8f93\u5165\u79d2\u6570\uff1a')\n\/\/ 2\u2022\u5c01\u88c5\u51fd\u6570\nfunction getTime(t) {\n\/\/ console.log(t\uff09\/\/\u603b\u7684\u79d2\u6570\n\/\/3\u3001\u8f6c\u6362\n\/\/\u5c0f\u65f6:h=parseInt(\u603b\u79d2\u6570\/60\/60%24)\n\/\/\u5206\u949f:m=parseInt(\u603b\u79d2\u6570\/60%60)\n\/\/ \u79d2\u6570\uff1a s = parseInt(\u603b\u79d2\u6570 % 60)\nh = parseInt(t \/ 60\/ 60% 24)\nm = parseInt(t \/ 60 % 60)\ns = parseInt(t % 60)\nh=h< 10?'0'+ h : h\nm=m<10?'0'+m:m\ns = s< 10? '0'+ s: s\n\/\/ console.log(h, m, s)\nreturn`\u8f6c\u6362\u5b8c\u6bd5\u4e4b\u540e\u662f${h}\u5c0f\u65f6${m}\u5206${s}\u79d2`\n}\nlet str = getTime(second)\ndocument.write(str)\n<\/script><\/code><\/pre>\n\n\n\n
    \u903b\u8f91\u4e2d\u65ad<\/p>\n\n\n\n
    <script>\nfunction fn(x, y) {\nx = x || 0\n\ny = y || 0\nconsole.log(x + y)\n}\nfn(l, 2)\nfn()\n<\/script><\/code><\/pre>\n\n\n\n
    \u4e0d\u4ec5\u662f\u5f62\u53c2\uff0c\u8fd8\u6709\u9875\u9762\u6eda\u52a8\u65f6\u83b7\u53d6<\/p>\n\n\n\n
    \u77ed\u8def<\/p>\n\n\n\n
    \u77ed\u8def\uff1a\u53ea\u5b58\u5728\u4e8e&&\u548cII\u4e2d\uff0c\u5f53\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6\u4f1a\u8ba9\u53f3\u8fb9\u4ee3\u7801\u4e0d\u6267\u884c<\/p>\n\n\n\n
    \u7b26\u53f7<\/td>\u6761\u4ef6<\/td><\/tr>
    &&<\/td>\u5de6\u8fb9\u4e3afalse\u5c31\u77ed\u8def<\/td><\/tr>
    ||<\/td>\u5de6\u8fb9\u4e3ature\u5c31\u77ed\u8def<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u539f\u56e0\uff1a\u901a\u8fc7\u5de6\u8fb9\u80fd\u5f97\u5230\u6574\u4e2a\u5f0f\u5b50\u7684\u7ed3\u679c\uff0c\u56e0\u6b64\u6ca1\u5fc5\u8981\u518d\u5224\u65ad\u53f3\u8fb9<\/p>\n\n\n\n
    \u8f6c\u6362bool\u578b<\/h3>\n\n\n\n
    \u8bb0\u5fc6\uff1a'   '\u30010\u3001undefined\u3001null\u3001false\u3001NaN\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\u540e\u90fd\u662ffalse,\u5176\u4f59\u5219\u4e3a true<\/p>\n\n\n\n
    \u9690\u5f0f\u8f6c\u6362:
    1 .\u6709\u5b57\u7b26\u4e32\u7684\u52a0\u6cd5+1,\u7ed3\u679c\u662f\"1\"
    2 .\u51cf\u6cd5-\uff08\u50cf\u5927\u591a\u6570\u6570\u5b66\u8fd0\u7b97\u4e00\u6837\uff09\u53ea\u80fd\u7528\u4e8e\u6570\u5b57\uff0c\u5b83\u4f1a\u4f7f\u7a7a\u5b57\u7b26\u4e32\"\"\u8f6c\u6362\u4e3a0
    3 . null\u7ecf\u8fc7\u6570\u5b57\u8f6c\u6362\u4e4b\u540e\u4f1a\u53d8\u4e3a0
    4 . undefined\u7ecf\u8fc7\u6570\u5b57\u8f6c\u6362\u4e4b\u540e\u4f1a\u53d8\u4e3aNaN<\/p>\n\n\n\n
    console.log('' - 1)                    \/\/-1\nconsole.log( 'pink\u8001\u5e08'-1)             \/\/NaN\nconsole.log(null + 1)                 \/\/1\nconsole.log(undefined + 1)            \/\/NaN\nconsole.log(NaN + 1)                  \/\/NaN<\/code><\/pre>\n\n\n\n
    \u5bf9\u8c61<\/h1>\n\n\n\n
    \u548cC\u7684\u7ed3\u6784\u4f53\u7c7b\u4f3c\uff1fjava\u7684\u7c7b\uff1fpy\u7684\u5b57\u5178key\u8981\u5b57\u7b26\uff1f<\/p>\n\n\n\n
    \u5bf9\u8c61\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u7ec4\u6210<\/p>\n\n\n\n
    let \u5bf9\u8c61\u540d={<\/p>\n\n\n\n
    \u5c5e\u6027\uff1a\u5c5e\u6027\u503c\uff0c<\/p>\n\n\n\n
    \u65b9\u6cd5\uff1a\u51fd\u6570<\/p>\n\n\n\n
    }<\/p>\n\n\n\n
    \u5c5e\u6027<\/h3>\n\n\n\n
    \u2022 \u6570\u636e\u63cf\u8ff0\u6027\u7684\u4fe1\u606f\u79f0\u4e3a\u5c5e\u6027\uff0c\u5982\u4eba\u7684\u59d3\u540d\u3001\u8eab\u9ad8\u3001\u5e74\u9f84\u3001\u6027\u522b\u7b49\uff0c\u4e00\u822c\u662f\u540d\u8bcd\u6027\u7684\u3002<\/p>\n\n\n\n
    let obj = {\nuname: 'pink\u8001\u5e08',\nage: 18,\ngender:'\u5973'\n}<\/code><\/pre>\n\n\n\n
      \n
    1. \u5c5e\u6027\u90fd\u662f\u6210\u5bf9\u51fa\u73b0\u7684\uff0c\u5305\u62ec\u5c5e\u6027\u540d\u548c\u503c\uff0c\u5b83\u4eec\u4e4b\u95f4\u4f7f\u7528\u82f1\u6587\uff1a\u5206\u9694<\/li>\n\n\n\n
    2. \u591a\u4e2a\u5c5e\u6027\u4e4b\u95f4\u4f7f\u7528\u82f1\u6587\uff0c\u5206\u9694<\/li>\n\n\n\n
    3. \u5c5e\u6027\u5c31\u662f\u4f9d\u9644\u5728\u5bf9\u8c61\u4e0a\u7684\u53d8\u91cf\uff08\u5916\u9762\u662f\u53d8\u91cf\uff0c\u5bf9\u8c61\u5185\u662f\u5c5e\u6027\uff09<\/li>\n\n\n\n
    4. \u5c5e\u6027\u540d\u53ef\u4ee5\u4f7f\u7528\"\"\u6216\"\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u7701\u7565\uff0c\u9664\u975e\u540d\u79f0\u9047\u5230\u7279\u6b8a\u7b26\u53f7\u5982\u7a7a\u683c\u3001\u4e2d\u6a2a\u7ebf\u7b49<\/li>\n<\/ol>\n\n\n\n
       \u6570\u5b57\u8fc7\u957f\uff0c\u5c3d\u91cf\u7528\u5b57\u7b26\u4e32\u5305\u4e00\u4e0b\uff0c\u8981\u4e0d\u7136\u524d\u540e\u7aef\u4f20\u503c\u4f1a\u4e22\u5931\u7cbe\u5ea6<\/p>\n\n\n\n
      \u5c5e\u6027---\u67e5<\/h5>\n\n\n\n
      \u76ee\u6807\uff1a\u80fd\u591f\u4f7f\u7528\u5bf9\u8c61\u4e2d\u7684\u6570\u636e
      \u2022\u58f0\u660e\u5bf9\u8c61\uff0c\u5e76\u6dfb\u52a0\u4e86\u82e5\u5e72\u5c5e\u6027\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528\u2022\u83b7\u5f97\u5bf9\u8c61\u4e2d\u5c5e\u6027\u5bf9\u5e94\u7684\u503c\uff0c\u6211\u79f0\u4e4b\u4e3a\u5c5e\u6027\u8bbf\u95ee\u3002
      \u2022\u8bed\u6cd5\uff1a\u5bf9\u8c61\u540d.\u5c5e\u6027
      \u2022\u7b80\u5355\u7406\u89e3\u5c31\u662f\u83b7\u5f97\u5bf9\u8c61\u91cc\u9762\u7684\u5c5e\u6027\u503c\u3002<\/p>\n\n\n\n
      let person = {\nuname: 'pink\u8001\u5e08',\nage: 18,\ngender:'\u5973'\n}\nconsole.log(person.uname)\nconsole.log(person.age)\nconsole.log(person.gender)<\/code><\/pre>\n\n\n\n
      \u5c5e\u6027-----\u6539<\/h5>\n\n\n\n
      \u8bed\u6cd5\uff1a\u5bf9\u8c61\u540d.\u5c5e\u6027=\u65b0\u503c<\/p>\n\n\n\n
      let person = {\nuname: 'pink\u8001\u5e08',\nage:18,\ngender:'\u5973'\n}\nperson. gender ='\u7537'\nconsole.log(person.gender) \/\/ \u4fee\u6539\u4e86\u4e3a\u7537\nconsole. log(persor))<\/code><\/pre>\n\n\n\n
      \u56e0\u4e3a\u5bf9\u8c61\u5b58\u653e\u5728\u5806\u4e2d\uff0c\u5220\u9664\u64cd\u4f5c\u4f1a\u76f4\u63a5\u5b9a\u4f4d\u5230\u5bf9\u8c61\u5b58\u653e\u7684\u5806\u4e2d\u7136\u540e\u5220\u9664\u5c5e\u6027\uff0c\u800c\u8bbf\u95ee\u5bf9\u8c61\u662f\u53bb\u5806\u4e2d\u5bfb\u627e\uff0c\u5806\u91cc\u9762\u5bf9\u8c61\u7684\u5c5e\u6027\u5df2\u7ecf\u88ab\u5220\u9664\uff0c\u6240\u4ee5\u53ea\u8981\u4f60\u8bbf\u95ee\u90a3\u4e2a\u5bf9\u8c61\uff0c\u88ab\u5220\u9664\u7684\u5c5e\u6027\u5c31\u90fd\u6ca1\u6709\u4e86<\/s><\/p>\n\n\n\n
      \u6539\u548c\u589e\u8bed\u6cd5\u4e00\u6837\uff0c\u5224\u65ad\u6807\u51c6\u5c31\u662f\u5bf9\u8c61\u6709\u6ca1\u6709\u8fd9\u4e2a\u5c5e\u6027\uff0c\u6ca1\u6709\u5c31\u662f\u65b0\u589e\uff0c\u6709\u5c31\u662f\u6539<\/p>\n\n\n\n
      let obj={\n    'good-name':'xiao mi 14',\n    num='10000015645',\n    weight:'0.55kg'\n    address:'\u4e2d\u56fd\u5927\u9646'\n}\nobj.name='xiaomi 14'\nobj.color ='\u7c89\u8272'\n\/\/ consoLe.Log(obj.name)\nconsole.log(obj.num)\nconsole.log(obj.weight)\nconsole\u2022log(obj.address)\nconsole.log(obj.color)\n\/\/ consoLe.Log(obj.goods - name)\n\/\/\u67e5\u7684\u53e6\u5916\u4e00\u79cd\u5c5e\u6027:\n\/\/\u5bf9\u8c61\u540d\u300c\u5c5e\u6027\u540dr\nconsole.log(obj['goods-name'])\n\/\/\u67e5\u603b\u7ed3:\n\/\/ (1)\u5bf9\u8c61\u540d.\u5c5e\u6027\u540dobj.age\nconsole.log(obj.num)\n\/\/ (2)\u5bf9\u8c61\u540d['\u5c5e\u6027\u540d'obj ['age']\nconsole.log(obj['num'])<\/code><\/pre>\n\n\n\n
      \u65b9\u6cd5<\/h3>\n\n\n\n
      \u6570\u636e\u884c\u4e3a\u6027\u7684\u4fe1\u606f\u79f0\u4e3a\u65b9\u6cd5\uff0c\u5982\u8dd1\u6b65\u3001\u5531\u6b4c\u7b49\uff0c\u4e00\u822c\u662f\u52a8\u8bcd\u6027\u7684\uff0c\u5176\u672c\u8d28\u662f\u51fd\u6570\u3002<\/p>\n\n\n\n
      let person = {\n\nname: 'andy',\n\nsayHi: function() {\n\n document.write('hi~~') \n\n    }\n\n}\n\/\/\u5bf9\u8c61\u540d.\u65b9\u6cd5\u540d()\nperson.sayHi()\n<\/code><\/pre>\n\n\n\n
      1\uff0e\u65b9\u6cd5\u662f\u7531\u65b9\u6cd5\u540d\u548c\u51fd\u6570\u4e24\u90e8\u5206\u6784\u6210\uff0c\u5b83\u4eec\u4e4b\u95f4\u4f7f\u7528\uff1a\u5206\u9694<\/p>\n\n\n\n
      2\uff0e\u591a\u4e2a\u5c5e\u6027\u4e4b\u95f4\u4f7f\u7528\u82f1\u6587\uff0c\u5206\u9694<\/p>\n\n\n\n
      3\uff0e\u65b9\u6cd5\u662f\u4f9d\u9644\u5728\u5bf9\u8c61\u4e2d\u7684\u51fd\u6570<\/p>\n\n\n\n
      4\uff0e\u65b9\u6cd5\u540d\u53ef\u4ee5\u4f7f\u7528\uff02\uff02\u6216\uff02\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u7701\u7565\uff0c\u9664\u975e\u540d\u79f0\u9047\u5230\u7279\u6b8a\u7b26\u53f7\u5982\u7a7a\u683c\u3001\u4e2d\u6a2a\u7ebf\u7b49<\/p>\n\n\n\n
      \u904d\u5386\u5bf9\u8c61<\/h3>\n\n\n\n
      <script>\n\n\/\/for in \u6211\u4eec\u4e0d\u63a8\u8350\u904d\u5386\u6570\u7ec4\n\n\/\/Let arr = ['pink', 'red', 'blue'] \n\n\/\/for(Let k in arr){\n\nconsole.Log\uff08k\uff09 \n\n\/\/\u6570\u7ec4\u7684\u4e0b\u6807 \u7d22\u5f15\u53f7 \u4f46\u662f\u662f\u5b57\u7b26\u4e32\n\n'0'\n\n\n\n\/\/console.Log(arr[k]) \/\/ arr[k] \n\n\/\/ }\n\n<\/script> <\/code><\/pre>\n\n\n\n
      \u00b7\u904d\u5386\u5bf9\u8c61<\/p>\n\n\n\n
      let obj={ uname:'andy', age: 18, sex\uff1a'\u7537' }\n\nfor(let k in obj){\n\nconsole.log\uff08k\uff09\/\/\u6253\u5370\u5c5e\u6027\u540d\n\nconsole.log\uff08obj\uff3bk\uff3d\uff09\/\/\u6253\u5370\u5c5e\u6027\u503c<\/code><\/pre>\n\n\n\n
      \u00b7\u4e00\u822c\u4e0d\u7528\u8fd9\u79cd\u65b9\u5f0f\u904d\u5386\u6570\u7ec4\u3001\u4e3b\u8981\u662f\u7528\u6765\u904d\u5386\u5bf9\u8c61<\/p>\n\n\n\n
      \u00b7for in\u8bed\u6cd5\u4e2d\u7684k\u662f\u4e00\u4e2a\u53d8\u91cf\uff0c\u662f\u5b57\u7b26\u4e32<\/strong>\uff0c\u5728\u5faa\u73af\u7684\u8fc7\u7a0b\u4e2d\u4f9d\u6b21\u4ee3\u8868\u5bf9\u8c61\u7684\u5c5e\u6027\u540d<\/p>\n\n\n\n
      \u00b7\u7531\u4e8ek\u662f\u53d8\u91cf\uff0c\u6240\u4ee5\u5fc5\u987b\u4f7f\u7528\uff3b\uff3d\u8bed\u6cd5\u89e3\u6790<\/p>\n\n\n\n
      \u00b7\u4e00\u5b9a\u8bb0\u4f4f\uff1ak\u662f\u83b7\u5f97\u5bf9\u8c61\u7684\u5c5e\u6027\u540d\uff0c\u5bf9\u8c61\u540d\uff3bk\uff3d\u662f\u83b7\u5f97 \u5c5e\u6027\u503c \u200b<\/p>\n\n\n\n
      \"\"<\/figure>\n\n\n\n
      <body>\n\n<script>\n\nlet students=[\n\n{ name\uff1a'\u5c0f\u660e'\uff0cage\uff1a18\uff0cgender\uff1a'\u7537'\uff0chometown\uff1a'\u6cb3\u5317\u7701'}, \n{ name\uff1a'\u5c0f\u7ea2'\uff0cage\uff1a19\uff0cgender\uff1a'\u5973'\uff0chometown\uff1a'\u6cb3\u5357\u7701'}, \n{ name\uff1a'\u5c0f\u521a'\uff0cage\uff1a17\uff0cgender\uff1a'\u7537'\uff0chometown\uff1a'\u5c71\u897f\u7701'}, \n{ name\uff1a'\u5c0f\u4e3d'\uff0cage\uff1a18\uff0cgender\uff1a'\u5973'\uff0chometown\uff1a'\u5c71\u4e1c\u7701'} \n\n]\n\nfor (let i = 0; i < students.length; i++) { \n\n\/\/console.Log\uff08i\uff09 \uff0f\uff0f\u4e0b\u6807\u7d22\u5f15\u53f7\n\n\/\/console.Log\uff08students\uff3bi\uff3d\uff09 \n\n\/\/\u6bcf\u4e2a\u5bf9\u8c61 console.log(students[i].name)\n\nconsole.log(students[i].hometown) }\n\n<\/script> \n\n<\/body> <\/code><\/pre>\n\n\n\n
      \"\"<\/figure>\n\n\n\n
      table tr:nth-child(1){ \n\nbackground-color:#ddd;\n\ntable tr:not(:first-child):hover { \n\nbackground-color:#eee; \n\n}<\/code><\/pre>\n\n\n\n
      \u9664\u4e86\u7b2c\u4e00\u884c\uff0c\u5176\u4ed6\u9f20\u6807\u63a5\u89e6\u4f1a\u53d8\u5316\u5e95\u8272<\/p>\n\n\n\n
      <table>\n<caption>\u5b66\u751f\u5217\u8868<\/caption>\n<tr>\n\n<th>\u5e8f\u53f7<\/th>\n\n<th>\u59d3\u540d<\/th>\n\n<th>\u5e74\u9f84<\/th>\n\n<th>\u6027\u522b<\/th>\n\n<th>\u5bb6\u4e61<\/th>\n\n<\/tr>\n\n\n<script>\n\n\/\/ 1\uff0e\u6570\u636e\u51c6\u5907 let students=[\n\n{ name\uff1a\uff07\u5c0f\u660e\uff07\uff0cage\uff1a18\uff0cgender\uff1a'\u7537'\uff0chometown\uff1a'\u6cb3\u5317\u7701'}\uff0c \n{ name\uff1a\uff07\u5c0f\u7ea2\uff07\uff0cage\uff1a19\uff0c gender\uff1a'\u5973'\uff0chometown\uff1a'\u6cb3\u5357\u7701'}\uff0c\n{ name\uff1a\uff07\u5c0f\u521a\uff07\uff0cage\uff1a17\uff0c gender\uff1a'\u7537'\uff0chometown\uff1a'\u5c71\u897f\u7701'}\uff0c\n{ name\uff1a\uff07\u5c0f\u4e3d\uff07\uff0cage\uff1a18\uff0cgender\uff1a'\u5973'\uff0chometown\uff1a'\u5c71\u4e1c\u7701'}\uff0c\n{ name\uff1a\uff07\u6653\u5f3a\uff07\uff0cage\uff1a16\uff0cgender\uff1a'\u5973'\uff0chometown\uff1a'\u84dd\u7fd4\u6280\u6821'}\n\n ]\n\n\/\/ 2\uff0e\u6e32\u67d3\u9875\u9762\n\nfor (let i = 0; i < students.length; i++) { \n\ndocument.write(`\n\n<tr>\n\n<td>${i + 1}<\/td>\n\n<td>${students[i].name}<\/td> \n\n<td>${students[i].age}<\/td> \n\n<td>${students[i].gender}<\/td> \n\n<td>${students[i] .hometown}<\/td>\n\n <\/tr>\n\n`)\n\n} \n\n<\/script> \n<\/table><\/code><\/pre>\n\n\n\n
      \u5185\u7f6e\u5bf9\u8c61<\/h3>\n\n\n\n
      \u5185\u7f6e\u5bf9\u8c61\u662fjavascript\u5185\u90e8\u63d0\u4f9b\u7684\u5bf9\u8c61<\/p>\n\n\n\n
      math<\/h5>\n\n\n\n
      \u4ecb\u7ecd\uff1aMath\u5bf9\u8c61\u662favaScript\u63d0\u4f9b\u7684\u4e00\u4e2a\u201c\u6570\u5b66\u201d\u5bf9\u8c61<\/p>\n\n\n\n
      \u4f5c\u7528\uff1a\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u505a\u6570\u5b66\u8fd0\u7b97\u7684\u65b9\u6cd5  <\/p>\n\n\n\n
      Math\u5bf9\u8c61\u5305\u542b\u7684\u65b9\u6cd5\u6709\uff1a  random\uff1a\u751f\u62100-1\u4e4b\u95f4\u7684\u968f\u673a\u6570\uff08\u5305\u542b0\u4e0d\u5305\u62ec1\uff09<\/p>\n\n\n\n
      ceil\uff1a\u5411\u4e0a\u53d6\u6574  <\/p>\n\n\n\n
      floor\uff1a\u5411\u4e0b\u53d6\u6574 <\/p>\n\n\n\n
      max\uff1a\u627e\u6700\u5927\u6570  <\/p>\n\n\n\n
      min\uff1a\u627e\u6700\u5c0f\u6570 <\/p>\n\n\n\n
      pow\uff1a\u5e55\u8fd0\u7b97 <\/p>\n\n\n\n
      abs\uff1a\u7edd\u5bf9\u503c  <\/p>\n\n\n\n
      Math\u5bf9\u8c61\u5728\u7ebf\u6587\u6863   <\/p>\n\n\n\n
      \/\/ ceiL\u5929\u82b1\u677f\u5411\u4e0a\u53d6\u6574\nconsole.log(Math.ceil(1.1)) \/\/ 2\nconsole.log(Math.ceil(1.5)) \/\/ 2\nconsole.log(Math.ceil(1.9)) \/\/ 2\n\/\/ fLoor\u5730\u677f\u5411\u4e0b\u53d6\u6574\nconsole.log(Math.floor(1.1)) \/\/ 1\nconsole.log(Math.floor(1.5)) \/\/ 2\nconsole.log(Math.floor(1.9)) \/\/ 1\nconsole.log(Math.floor('12px')) \/\/ 1\nconsole.log('--------------- ')\n\/\/\u56db\u820d\u4e94\u5165round\nconsole.log(Math.round(1.1)) \/\/ 1\nconsole.log(Math.round(1.49)) \/\/ 1\nconsole.log(Math.round(l.5)) \/\/ 2\nconsole.log(Math.round(1.9)) \/\/ 2\nconsole.log(Math.round(-1.1)) \/\/ -1\nconsole.log(Math.round(-1.5)) \/\/ -1\nconsole.log(Math.round(-1.51)) \/\/ -2\n\/\/\u53d6\u6574\u51fd\u6570par*\u5de5M(1.2) \/\/ 1\n\/\/ \u53d6\u6574\u51fd\u6570 parseint(' 12px') \/\/ 12<\/code><\/pre>\n\n\n\n
      \u4e5f\u53ef\u4ee5\u52a8\u6001\u4e3a\u5bf9\u8c61\u6dfb\u52a0\u5c5e\u6027\uff0c\u52a8\u6001\u6dfb\u52a0\u548c\u76f4\u63a5\u5b9a\u4e49\u4e00\u6837\uff0c\u53ea\u662f\u8bed\u6cd5\u66f4\u7075\u6d3b<\/p>\n\n\n\n
      \u6211\u58f0\u660e\u7684\u53d8\u91cf\u5c06\u8981\u63a8\u8fdb\u5bf9\u8c61\uff0c\u4f46\u662f\u5bf9\u8c61\u8fd8\u6ca1\u6709\u51c6\u5907\u597d\uff0c\u5148\u7528null\u6765\u5360\u4f4d\uff08object\uff09<\/p>\n\n\n\n
      \u5185\u7f6e\u5bf9\u8c61--\u751f\u6210\u4efb\u610f\u8303\u56f4\u968f\u673a\u6570<\/p>\n\n\n\n
      \/\/\u5de6\u95ed\u53f3\u5f00 \u80fd\u53d6\u52300 \u4f46\u662f\u53d6\u4e0d1 \u4e2d\u95f4\u7684\u4e00\u4e2a\u968f\u673a\u5c0f\u6570\nconsole.log(Math.random())\n\/\/\u8fd9\u662f0-10\u7684\u968f\u673a\u6570\nMath.floor(Math.random()*(10+1))\nconsole.log(Math.floor(Math.random()*11))\n\/\/\u5982\u4f55\u751f\u6210N-M\u4e4b\u95f4\u7684\u968f\u673a\u6570\nMath.floor(Math.random() * (M - N + 1)) + N<\/code><\/pre>\n\n\n\n
      \u968f\u673a\u70b9\u540d\u6848\u4f8b<\/h5>\n\n\n\n
      let arr =['\u8d75\u4e91','\u9ec4\u5fe0'\uff0c'\u5173\u7fbd'\uff0c'\u5f20\u98de'\uff0c'\u9a6c\u8d85'\uff0c'\u5218\u5907'\uff0c'\u66f9\u64cd']\n\/\/ \u5f97\u5230\u4e00\u4e2a\u968f\u673a\u6570,\u4f5c\u4e3a\u6570\u7ec4\u7684\u7d22\u5f15\u53f7,\u8fd9\u4e2a\u968f\u673a\u65700~5\nlet random = Math.floor(Math.random()* arr.length)\n\/\/ 2.\u9875\u9762\u8f93\u51fa\u6570\u7ec4\u91cc\u9762\u7684\u5143\u7d20\ndocument.write(arr[random])\n\/\/ 3.splice(\u8d77\u59cb\u4f4d\u7f6e(\u4e0b\u6807),\u5220\u9664\u51e0\u4e2a\u5143\u7d22)\narr.splice(random, 1)\nconsole.log(arr)<\/code><\/pre>\n\n\n\n
       \u731c\u6570\u5b57\u6848\u4f8b<\/h5>\n\n\n\n
      \/\/ 1.\u968f\u673a\u751f\u6210\u4e00\u4e2a\u65701-10\n\/\/\u53d6\u5230N ~ M\u7684\u968f\u673a\u6574\u6570\nfunction getRandom(N, M) {\nreturn Math.floor(Math.random() * (M - N + 1)) + N\nlet random = getRandom(l, 10)\nconsole.log(random)\n\/\/\u9700\u8981\u4e0d\u65ad\u7684\u5faa\u73af\nwhile (true) {\n\/\/ 2.\u8f93\u5165\u4e00\u4e2a\u503c\nlet num = +prompt('\u8bf7\u8f93\u5165\u4f60\u731c\u7684\u6570\u5b57\uff1a')\n\/\/ 3.\u5224\u65ad\u8f93\u51fa\nif (num > random) {\nalert('\u60a8\u731c\u5927\u4e86')\n} \nelse if (num < random) {\nalert ('\u60a8\u731c\u5c0f\u4e86')\n} \nelse {\nalert('\u731c\u5bf9\u5566\uff0c\u771f\u5389\u5bb3')\nbreak \/\/\u9000\u51fa\u5faa\u73af\n}\n}<\/code><\/pre>\n\n\n\n
      \/\/ 1.\u968f\u673a\u751f\u6210\u4e00\u4e2a\u6570\u5b571~10\n\/\/\u53d6\u5230N ~ M\u7684\u968f\u673a\u6574\u6570\nfunction getRandom(N, M) {\nreturn Math.floor(Math.random() * (M - N + 1)) + N\n}\nlet random = getRandom(l, 10)\n\/\/ 2.\u8bbe\u5b9a\u4e09\u6b21 \u4e8c\u6b21\u6ca1\u731c\u5bf9\u5c31\u76f4\u63a5\u9000\u51fa\nlet flag = true \/\/ \u5f00\u5173\u53d8\u4f9d\nfor (let i = 1; i<=3;i++){\nlet num = +prompt(`\u8bf7\u8f93\u51651~10\u4e4b\u95f4\u7684\u4e00\u4e2a\u6570\u5b57`)\n\nif(num > random) {\nalert('\u60a8\u731c\u5927\u4e86\uff0c\u7ee7\u7eed')\n} \nelse if (num < random) {\nalert('\u60a8\u731c\u5c0f\u4e86\uff0c\u7ee7\u7eed')\n} \nelse {\nflag = false\nalert('\u731c\u5bf9\u4e86\uff0c\u771f\u5389\u5bb3!')\nbreak\n}\n}\nif(flag) {\nalert('\u6b21\u6570\u5df2\u7ecf\u7528\u5b8c')\n}\n<\/script><\/code><\/pre>\n\n\n\n
      \u968f\u673argb16\u8fdb\u5236\u989c\u8272<\/p>\n\n\n\n
      <style>\ndiv{\nwidth:300px;\nheight:300px;\n}\n<\/style>\n<\/head>\n\n<body>\n<div><\/div>\n<script>\n\/\/1.\u81ea\u5b9a\u4e49\u4e00\u4e2a\u968f\u673a\u989c\u8272\u51fd\u6570\nfunction getRandomColor(flag){\nif (flag) {\n\/\/3.\u5982\u679c\u662ftrue\u5219\u8fd4\u56de#f\nlet str = '#'\nlet arr = ['0', '1', '2', '3', '4', '5', '6', '7',\n'8', '9', 'a', 'b', 'c', 'd', 'e', 'f']\n\/\/\u5229\u7528for\u5faa\u73af\u968f\u673a\u62bd6\u6b21\u7d2f\u52a0\u5230 str\u91cc\u9762\nfor (let i = 1; i <= 6; i++) {\n\/\/\u6bcf\u6b21\u8981\u968f\u673a\u4ece\u6570\u7ec4\u91cc\u9762\u62bd\u53d6\u4e00\u4e2a\n\/\/random\u662f\u7ec4\u7684\u7d22\u53f7\u662f\u968f\u673a\u7684\nlet random = Math.floor(Math.random() * arr.length)\n\/\/ str = str + arr[random]\nstr += arr[random]\n}\nreturn str\n}else {\n\/\/ 4\u3002 \u5426\u5219\u662f false \u5219\u8fd4\u56de rgb(255,255,255)\nlet r = Math.floor(Math.random() * 256) \/\/ 55\nlet g = Math.floor(Math.random() * 256) \/\/ 89\nlet b = Math.floor(Math.random() * 256) \/\/ 255\nreturn `rgb(${r},${g},${b})`\n}\n}\n\/\/2\u3002\u8c03\u7528\u51fd\u6570 getRandomCoLor(\u5e03\u5c14\u503c)\nconsole.log(getRandomColor(false))\nconsole.log(getRandomColor(true))\n\/\/let str = '#'\n\/\/str = str + 'f'\n\n<\/script>\n<\/body>\n<\/code><\/pre>\n\n\n\n
      \u6e32\u67d3\u5b66\u6210\u5728\u7ebf<\/h5>\n\n\n\n
      <script>\nlet data = [\nsrc: 'images\/course01.png',\ntitle: 'Think PHP 5.0 \u535a\u5ba2\u7cfb\u7edf\u5b9e\u6218\u9879\u76ee\u6f14\u7ec3',\nnum: 1125\nsrc: 'images\/course02.png',\ntitle: 'Android \u7f51\u52a8\u6001\u56fe\u7247\u52a0\u5b9e'\uff0c\nnum: 357\nsrc: 'images\/course03.png',\ntitle: 'Angular2 \u5927\u524d\u7aef\u5546\u57ce\u5b9e\u6218\u9879\u76ee\u6f14\u7ec3',\nnum: 22250\nsrc: 'images\/course04.png',\ntitle: 'Android APP \u5b9e\u6218\u9879\u76ee\u6f14\u7ec3',\nnum: 389\n},\n{\nsrc: 'images\/course05.png',\ntitle: 'UGUI\u6e90\u7801\u6df1\u5ea6\u5206\u6790\u6848\u4f8b',\nnum: 124\n},\nsrc: 'images\/course06.png',\ntitle:'Kami2\u9996\u9875\u754c\u9762\u5207\u6362\u6548\u679c\u5b9e\u6218\u6f14\u7ec3'\uff0c\nnum: 432\n},\n{\nsrc: 'images\/course07.png',\ntitle: 'UNITY\u4ece\u5165\u95e8\u5230\u7cbe\u901a\u5b9e\u6218\u6848\u4f8b'\uff0c\nnum: 888\n},\n{\nsrc: 'images\/course08.png',\ntitle: 'Cocos\u6df1\u5ea6\u5b66\u4e60\u4f60\u4e0d\u4f1a\u9519\u8fc7\u7684\u5b9e\u6218'\uff0c\nnum: 590\n}\n]\nfor (let i = 0; i < data.length; i++) {\ndocument.write('\n<li>\n<a href=\"#\">\n<img src=${data[i].src} title=\"${data[i].title}\">\n<h4>\n${data[i].title}\n<\/h4>\n<div class=\"info\">\n<span>\u9ad8\u7ea7\u3003span>\u2022 <span>${data[i].num}<\/span>\u4eba\u5728\u5b66\u4e60\n<\/div>\n<\/a>\n<\/li>\n`)\n}\n<\/script><\/code><\/pre>\n\n\n\n
      \u76ee\u6807\uff1a\u4e86\u89e3\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u5b58\u50a8\u65b9\u5f0f
      \u7b80\u5355\u7c7b\u578b\u53c8\u53eb\u505a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6216\u8005\u503c\u7c7b\u578b\uff0c\u590d\u6742\u7c7b\u578b\u53c8\u53eb\u505a\u5f15\u7528\u7c7b\u578b\u3002<\/p>\n\n\n\n
      \u2022 \u503c\u7c7b\u578b\uff1a\u7b80\u5355\u6570\u636e\u7c7b\u578b\/\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5728\u5b58\u50a8\u65f6\u53d8\u91cf\u4e2d\u5b58\u50a8\u7684\u662f\u503c\u672c\u8eab\uff0c\u56e0\u6b64\u53eb\u505a\u503c\u7c7b\u578b<\/p>\n\n\n\n
      string , number, boolean, undefined, null<\/p>\n\n\n\n
      \u2022 \u5f15\u7528\u7c7b\u578b\uff1a\u590d\u6742\u6570\u636e\u7c7b\u578b\uff0c\u5728\u5b58\u50a8\u65f6\u53d8\u91cf\u4e2d\u5b58\u50a8\u7684\u4ec5\u4ec5\u662f\u5730\u5740\uff08\u5f15\u7528\uff09\uff0c\u56e0\u6b64\u53eb\u505a\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
      \u7a9f\u8fc7new\u5173\u952e\u5b57\u521b\u5efa\u7684\u5bf9\u8c61\uff08\u7cfb\u7edf\u5bf9\u8c61\u3001\u81ea\u5b9a\u4e49\u5bf9\u8c61\uff09\uff0c\u5982:bject\u3001Array. Date<\/p>\n\n\n\n
      1 \u3001\u6808\uff08\u64cd\u4f5c\u7cfb\u7edf\uff09\uff1a\u7531\u64cd\u4f5c\u7cfb\u7edf\u81ea\u52a8\u5206\u914d\u91ca\u653e\u5b58\u653e\u51fd\u6570\u7684\u53c2\u6570\u503c\u3001\u5c40\u90e8\u53d8\u91cf\u7684\u503c\u7b49\u3002\u5176\u64cd\u4f5c\u65b9\u5f0f\u7c7b\u4f3c\u4e8e\u6570\u636e\u7ed3\u6784\u4e2d\u7684\u6808\uff1a\u7b80\u5355\u6570\u636e\u7c7b\u578b\u5b58\u653e\u5230\u94b1\u91cc\u9762\n2 \u3001\u5806\uff08\u64cd\u4f5c\u7cfb\u7edf\uff09\uff1a\u5b58\u50a8\u590d\u6742\u7c7b\u578b\uff08\u5bf9\u8c61\uff09\uff0c\u4e00\u822c\u7531\u7a0b\u5e8f\u5458\u5206\u914d\u91ca\u653e\uff0c\u82e5\u7a0b\u5e8f\u5458\u4e0d\u91ca\u653e\uff0c\u7531\u5783\u573e\u56de\u6536\u673a\u5236\u56de\u6536\u3002\u5f15\u7528\u6570\u636e\u7c7b\u578b\u5b58\u653e\u5230\u5806\u91cc\u9762<\/pre>\n\n\n\n
      \u4ec5\u4e3a\u7406\u89e3 \u200b\u4e0b\u56fe\u8868\u793a\u8f93\u51fa\u7ed3\u679c\u4e3a20<\/p>\n\n\n\n
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