{"id":157,"date":"2018-10-25T17:37:39","date_gmt":"2018-10-25T09:37:39","guid":{"rendered":"http:\/\/www.maoyunwang.top\/?p=157"},"modified":"2018-10-25T17:37:39","modified_gmt":"2018-10-25T09:37:39","slug":"css%e5%92%8cjs%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/blog.tongyunli.top\/?p=157","title":{"rendered":"css\u548cjs\u603b\u7ed3"},"content":{"rendered":"<h1><\/h1>\n<h1>\u4e00.CSS<\/h1>\n<h2>1.CSS\u4ecb\u7ecd<\/h2>\n<p>CSS \u6307\u5c42\u53e0\u6837\u5f0f\u8868 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*\/<\/p>\n<p>\u6ce8\u610f:<\/p>\n<ul>\n<li>\u5728 CSS \u5b9a\u4e49\u4e2d\uff0ca:hover \u5fc5\u987b\u88ab\u7f6e\u4e8e a:link \u548c a:visited \u4e4b\u540e\uff0c\u624d\u662f\u6709\u6548\u7684\u3002<\/li>\n<li>\u5728 CSS \u5b9a\u4e49\u4e2d\uff0ca:active \u5fc5\u987b\u88ab\u7f6e\u4e8e a:hover \u4e4b\u540e\uff0c\u624d\u662f\u6709\u6548\u7684\u3002<\/li>\n<li>\u4f2a\u7c7b\u540d\u79f0\u5bf9\u5927\u5c0f\u5199\u4e0d\u654f\u611f\u3002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>5.CSS\u5c5e\u6027<\/h2>\n<h3>\u00d8\u00a0 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\u4f8b\u5982 color:#ffff00<\/p>\n<p>\uf06ctext-align:\u5b9a\u4e49\u6587\u672c\u5bf9\u9f50\u65b9\u5f0f \u4f8b\u5982:text-align:center<\/p>\n<p>text-decoration \u5411\u6587\u672c\u6dfb\u52a0\u4fee\u9970\u3002\u4f8b\u5982text-decoration:underline(\u4e0b\u5212\u7ebf)<\/p>\n<p>\uf06cletter-spacing:\u5b9a\u4e49\u5b57\u7b26\u95f4\u9694<\/p>\n<p>\uf06cword-spacing:\u5b9a\u4e49\u5b57\u95f4\u9694<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u80cc\u666f<\/h3>\n<p>CSS \u5141\u8bb8\u5e94\u7528\u7eaf\u8272\u4f5c\u4e3a\u80cc\u666f\uff0c\u4e5f\u5141\u8bb8\u4f7f\u7528\u80cc\u666f\u56fe\u50cf\u521b\u5efa\u76f8\u5f53\u590d\u6742\u7684\u6548\u679c\u3002CSS \u5728\u8fd9\u65b9\u9762\u7684\u80fd\u529b\u8fdc\u8fdc\u5728 HTML \u4e4b\u4e0a\u3002<\/p>\n<p>\u5e38\u7528\u5c5e\u6027:<\/p>\n<p>\uf06cbackground:\u7b80\u5199\u5c5e\u6027\uff0c\u4f5c\u7528\u662f\u5c06\u80cc\u666f\u5c5e\u6027\u8bbe\u7f6e\u5728\u4e00\u4e2a\u58f0\u660e\u4e2d<\/p>\n<p>\u683c\u5f0f\uff1a{background: \u989c\u8272 url(\u56fe\u7247\u8def\u5f84) \u91cd\u590d \u6eda\u52a8 \u4f4d\u7f6e}<\/p>\n<p>\u4f8b\u5982:\u00a0 {background: #00FF00 url(bgimage.gif) no-repeat fixed top}<\/p>\n<p>&nbsp;<\/p>\n<p>\uf06cbackground-color:\u5b9a\u4e49\u80cc\u666f\u989c\u8272<\/p>\n<p>\uf06cbackground-image:\u5b9a\u4e49\u80cc\u666f\u56fe\u7247\u00a0 background-image:url(xx.jpg)<\/p>\n<p>\uf06cbackground-position:\u5b9a\u4e49\u80cc\u666f\u56fe\u7247\u7684\u8d77\u59cb\u4f4d\u7f6e background-position:10% 5%;<\/p>\n<p>\uf06cbackground-repeat:\u5b9a\u4e49\u80cc\u666f\u56fe\u7247\u662f\u5426\u91cd\u590d\u53ca\u5982\u4f55\u91cd\u590d background-repeat:no-repeat<\/p>\n<h3>\u00d8\u00a0 \u5c3a\u5bf8<\/h3>\n<p>CSS \u5c3a\u5bf8 (Dimension) \u5c5e\u6027\u5141\u8bb8\u4f60\u63a7\u5236\u5143\u7d20\u7684\u9ad8\u5ea6\u548c\u5bbd\u5ea6\u3002<\/p>\n<p>\u5e38\u7528\u5c5e\u6027:<\/p>\n<p>\uf06cwidth:\u8bbe\u7f6e\u5143\u7d20\u7684\u5bbd\u5ea6<\/p>\n<p>\uf06cheight:\u8bbe\u7f6e\u5143\u7d20\u7684\u9ad8\u5ea6<\/p>\n<h3>\u00d8\u00a0 \u5217\u8868<\/h3>\n<p>CSS 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\u5c5e\u6027\u5141\u8bb8\u4f60\u5bf9\u5143\u7d20\u8fdb\u884c\u5b9a\u4f4d\u3002<\/p>\n<p>\u5b9a\u4f4d\u7684\u57fa\u672c\u601d\u60f3\u5f88\u7b80\u5355\uff0c\u5b83\u5141\u8bb8\u4f60\u5b9a\u4e49\u5143\u7d20\u6846\u76f8\u5bf9\u4e8e\u5176\u6b63\u5e38\u4f4d\u7f6e\u5e94\u8be5\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u6216\u8005\u76f8\u5bf9\u4e8e\u7236\u5143\u7d20\u3001\u53e6\u4e00\u4e2a\u5143\u7d20\u751a\u81f3\u6d4f\u89c8\u5668\u7a97\u53e3\u672c\u8eab\u7684\u4f4d\u7f6e<\/p>\n<p>\u5e38\u7528\u5c5e\u6027:<\/p>\n<p>\uf06cposition:\u628a\u5143\u7d20\u653e\u7f6e\u5230\u4e00\u4e2a\u9759\u6001\u7684,\u76f8\u5bf9\u7684\uff0c\u7edd\u5bf9\u7684\uff0c\u6216\u56fa\u5b9a\u7684\u4f4d\u7f6e\u4e2d\u3002<\/p>\n<p>\uf06ctop:\u5b9a\u4e49\u4e86\u5b9a\u4f4d\u5143\u7d20\u7684\u4e0a\u5916\u8fb9\u8ddd\u8fb9\u754c\u4e0e\u5176\u5305\u542b\u5757\u4e0a\u8fb9\u754c\u4e4b\u95f4\u7684\u504f\u79fb\u91cf<\/p>\n<p>\uf06cright: \u5b9a\u4e49\u4e86\u5b9a\u4f4d\u5143\u7d20\u53f3\u5916\u8fb9\u8ddd\u8fb9\u754c\u4e0e\u5176\u5305\u542b\u5757\u53f3\u8fb9\u754c\u4e4b\u95f4\u7684\u504f\u79fb<\/p>\n<p>\uf06cleft: \u5b9a\u4e49\u4e86\u5b9a\u4f4d\u5143\u7d20\u5de6\u5916\u8fb9\u8ddd\u8fb9\u754c\u4e0e\u5176\u5305\u542b\u5757\u5de6\u8fb9\u754c\u4e4b\u95f4\u7684\u504f\u79fb<\/p>\n<p>\uf06cbottom: \u5b9a\u4e49\u4e86\u5b9a\u4f4d\u5143\u7d20\u4e0b\u5916\u8fb9\u8ddd\u8fb9\u754c\u4e0e\u5176\u5305\u542b\u5757\u4e0b\u8fb9\u754c\u4e4b\u95f4\u7684\u504f\u79fb\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u5206\u7c7b<\/h3>\n<p>CSS 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\u662f\u4e24\u79cd\u5b8c\u5168\u4e0d\u540c\u7684\u8bed\u8a00<\/li>\n<li>JavaScript\u662fNetscape\u516c\u53f8\u7684\u4ea7\u54c1\uff0c\u524d\u8eab\u662fLiveScript\uff1bJava\u662fSun\u516c\u53f8\u7684\u4ea7\u54c1\uff0c\u73b0\u5728\u662fOracle\u516c\u53f8\u7684\u4ea7\u54c1\u3002<\/li>\n<li>JavaScript\u662f\u57fa\u4e8e\u5bf9\u8c61\uff0cJava\u662f\u9762\u5411\u5bf9\u8c61\u3002<\/li>\n<li>JavaScript\u53ea\u9700\u89e3\u91ca\u5c31\u53ef\u4ee5\u6267\u884c\uff0cJava\u9700\u8981\u5148\u7f16\u8bd1\u6210\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u518d\u6267\u884c<\/li>\n<li>JavaScript\u662f\u5f31\u7c7b\u578b\uff0cJava\u662f\u5f3a\u7c7b\u578b\u3002<\/li>\n<li>JavaScript\u4e0ejava\u4e00\u6837\u90fd\u533a\u5206\u5927\u5c0f\u5199<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 js\u4f5c\u7528:<\/h3>\n<p>\u901a\u8fc7js\u53ef\u4ee5\u6539\u53d8html\u5185\u5bb9,\u6539\u53d8html\u6837\u5f0f,\u8fdb\u884c\u9a8c\u8bc1\u8f93\u5165\u7b49\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>2.\u5bfc\u5165js<\/h2>\n<h3>\u00d8\u00a0 \u5728html\u9875\u9762\u4e2d\u76f4\u63a5\u63d2\u5165javascript<\/h3>\n<p>\u5728&lt;script&gt; \u548c &lt;\/script&gt; \u4e4b\u95f4\u7684\u7f16\u5199JavaScript\u4ee3\u7801.<\/p>\n<p>\u683c\u5f0f:<\/p>\n<p>&lt;script type=\u201dtext\/javascript\u201d&gt;<\/p>\n<p>js\u4ee3\u7801<\/p>\n<p>&lt;\/script&gt;<\/p>\n<p>\u8001\u65e7\u7684\u5b9e\u4f8b\u53ef\u80fd\u4f1a\u5728 &lt;script&gt; \u6807\u7b7e\u4e2d\u4f7f\u7528 type=&#8221;text\/javascript&#8221;\u3002\u73b0\u5728\u5df2\u7ecf\u4e0d\u5fc5\u8fd9\u6837\u505a\u4e86\u3002JavaScript \u662f\u6240\u6709\u73b0\u4ee3\u6d4f\u89c8\u5668\u4ee5\u53ca HTML5 \u4e2d\u7684\u9ed8\u8ba4\u811a\u672c\u8bed\u8a00\u3002<\/p>\n<h3>\u00d8\u00a0 \u5f15\u5165\u5916\u90e8\u7684javascript<\/h3>\n<p>\u6709\u65f6\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u82e5\u5e72\u4e2a\u9875\u9762\u4e2d\u8fd0\u884cJavaScript\uff0c\u540c\u65f6\u4e0d\u5728\u6bcf\u4e2a\u9875\u9762\u4e2d\u5199\u76f8\u540c\u7684\u811a\u672c\u3002<\/p>\n<p>\u6211\u4eec\u5c31\u53ef\u4ee5\u5c06 JavaScript \u5199\u5165\u4e00\u4e2a\u5916\u90e8\u6587\u4ef6\u4e4b\u4e2d\u3002\u7136\u540e\u4ee5 .js \u4e3a\u540e\u7f00\u4fdd\u5b58\u8fd9\u4e2a\u6587\u4ef6\u3002\u7136\u540e\u901a\u8fc7&lt;script type=\u201dtext\/javascript\u201d&gt;\u6807\u7b7e\u7684src\u5c5e\u6027\u5f15\u5165.<\/p>\n<p>\u683c\u5f0f:<\/p>\n<p>&lt;script type=\u201dtext\/javascript\u201d src=\u201d\u5916\u90e8js\u8def\u5f84\u201d&gt;&lt;\/script&gt;<\/p>\n<h3>\u00d8\u00a0 \u6ce8\u610f:<\/h3>\n<ul>\n<li>&lt;script&gt;\u5b58\u653e\u7684\u4f4d\u7f6e.\u4e00\u822c\u5efa\u8bae\u653e\u5728&lt;head&gt;\u6807\u7b7e\u4f53\u4e2d.\u7531\u4e8ejs\u662f\u89e3\u91ca\u6027\u8bed\u8a00,<\/li>\n<li>\u5916\u90e8\u7684js\u6587\u4ef6\u4e2d\u4e0d\u80fd\u5305\u542b&lt;script&gt;\u6807\u7b7e\u3002<\/li>\n<li>&lt;script&gt;\u6807\u7b7e\u5982\u679c\u4f7f\u7528\u4e86src\u5c5e\u6027,\u6807\u7b7e\u4f53\u5185\u7684\u4ee3\u7801\u4e0d\u518d\u89e3\u6790.<\/li>\n<\/ul>\n<h2>3.js\u57fa\u7840-\u53d8\u91cf\u58f0\u660e<\/h2>\n<p>javascript\u4e2d\u7684\u53d8\u91cf\u4e0e\u6211\u4eec\u5728java\u4e2d\u7684\u53d8\u91cf\u4e00\u6837\u3002<\/p>\n<p>\u5728javascript\u4e2d\u4f7f\u7528\u7528 var \u8fd0\u7b97\u7b26\uff08variable \u7684\u7f29\u5199\uff09\u52a0\u53d8\u91cf\u540d\u5b9a\u4e49<\/p>\n<p>\u683c\u5f0f:<\/p>\n<ul>\n<li>var \u53d8\u91cf\u540d =\u521d\u59cb\u5316\u503c;<\/li>\n<li>var \u53d8\u91cf\u540d;<\/li>\n<\/ul>\n<p>\u53d8\u91cf\u540d=\u521d\u59cb\u5316\u503c;<\/p>\n<p>&nbsp;<\/p>\n<p>javascript \u53d8\u91cf\u540d\u79f0\u7684\u89c4\u5219\u548c\u6211\u4eecjava\u4e2d\u7684\u89c4\u5219\u4e00\u6837\uff1a<\/p>\n<p>\u53d8\u91cf\u5fc5\u987b\u4ee5\u5b57\u6bcd ,\u4e0b\u5212\u7ebf\u6216\u8005$\u5f00\u59cb<\/p>\n<p>\u533a\u5206\u5927\u5c0f\u5199<\/p>\n<p>\u4e0d\u80fd\u662f\u5173\u952e\u5b57<\/p>\n<p>\u89c1\u540d\u77e5\u610f(js\u662f\u5f31\u7c7b\u578b,\u56e0\u6b64\u6574\u6570\u7c7b\u578b\u5efa\u8baeiXxx,boolean\u7c7b\u578b\u5efa\u8baebXxx ,\u6570\u7ec4\u5efa\u8bae aXxx\u7b49\u7b49)<\/p>\n<p>&nbsp;<\/p>\n<p>\u6ce8\u610f:<\/p>\n<ul>\n<li>\u53d8\u91cf\u58f0\u660e\u4e0d\u662f\u5fc5\u987b\u7684.<\/li>\n<li>\u53d8\u91cf\u5982\u679c\u8981\u58f0\u660e,var\u53ef\u4ee5\u7701\u7565,\u5efa\u8bae\u4e0d\u8981\u7701\u7565<\/li>\n<\/ul>\n<p>3.\u6bcf\u884c\u7ed3\u5c3e\u7684\u5206\u53f7\u53ef\u6709\u53ef\u65e0,\u6709\u7684\u6d4f\u89c8\u5668\u4e0d\u517c\u5bb9,\u5efa\u8bae\u4e0d\u8981\u7701\u7565<\/p>\n<h2>4.js\u57fa\u7840-\u6570\u636e\u7c7b\u578b<\/h2>\n<p>\u5728ECMAScript\u4e2d\uff0c\u53d8\u91cf\u53ef\u4ee5\u5b58\u5728\u4e24\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5373\u539f\u59cb\u7c7b\u578b\u4e0e\u5f15\u7528\u7c7b\u578b\u3002<\/p>\n<h3>\u00d8\u00a0 \u539f\u59cb\u7c7b\u578b<\/h3>\n<p>ECMAScript \u6709 5 \u79cd\u539f\u59cb\u7c7b\u578b\uff08primitive type\uff09\uff0c\u5373 Undefined\u3001Null\u3001Boolean\u3001Number \u548c String.<\/p>\n<p>&nbsp;<\/p>\n<p>\u6211\u4eec\u5148\u6765\u4e86\u89e3\u4e0b\u8fd95\u4e2d\u539f\u59cb\u7c7b\u578b.<\/p>\n<ul>\n<li>Undefined \u7c7b\u578b\u53ea\u6709\u4e00\u4e2a\u503c\uff0c\u5373 undefined\u3002\u5f53\u58f0\u660e\u7684\u53d8\u91cf\u672a\u521d\u59cb\u5316\u65f6\uff0c\u8be5\u53d8\u91cf\u7684\u9ed8\u8ba4\u503c\u662f undefined\u3002\u5f53\u51fd\u6570\u65e0\u660e\u786e\u8fd4\u56de\u503c\u65f6\uff0c\u8fd4\u56de\u7684\u4e5f\u662f\u503c &#8220;undefined&#8221;.<\/li>\n<li>Null\u7c7b\u578b\u4e5f\u53ea\u6709\u4e00\u4e2a\u503c null\uff0c\u5373\u5b83\u7684\u5b57\u9762\u91cf\u3002\u503cundefined\u5b9e\u9645\u4e0a\u662f\u4ece\u503cnull\u6d3e\u751f\u6765\u7684\uff0c\u56e0\u6b64 ECMAScript \u628a\u5b83\u4eec\u5b9a\u4e49\u4e3a\u76f8\u7b49\u7684\u3002\u4f8b\u5982\uff1aalert(null == undefined); \u8f93\u51fa&#8221;true&#8221;<\/li>\n<li>Boolean \u7c7b\u578b\u6709\u4e24\u4e2a\u503c true \u548c<\/li>\n<li>Number \u7c7b\u578b,\u5728js\u4e2d\u4efb\u4f55\u6570\u5b57\u90fd\u770b\u6210\u662fNumber\u7c7b\u578b,\u4e0d\u8bba\u6574\u6570,\u8fd8\u662f\u6d6e\u70b9\u6570,\u5f53\u7136\u8868\u793a\u516b\u8fdb\u5236\u9996\u6570\u5b57\u5fc5\u987b\u662f0,\u5341\u516d\u8fdb\u5236\u4f7f\u75280x\u5f00\u59cb\u7b49.\u6570\u5b57\u7684\u6700\u5927\u503c:Number.MAX_VALUE,\u6570\u5b57\u7684\u6700\u5c0f\u503c:Number.MIN_VALUE.<\/li>\n<li>String\u7c7b\u578b\u662f\u552f\u4e00\u6ca1\u6709\u56fa\u5b9a\u5927\u5c0f\u7684\u539f\u59cb\u7c7b\u578b,\u5b57\u9762\u91cf\u662f\u7531\u53cc\u5f15\u53f7\uff08&#8221;\uff09\u6216\u5355\u5f15\u53f7\uff08&#8217;\uff09\u58f0\u660e\u7684,\u6ca1\u6709\u5b57\u7b26\u7c7b\u578b\u6982\u5ff5.String \u7c7b\u578b\u8fd8\u5305\u62ec\u51e0\u79cd\u5b57\u7b26\u5b57\u9762\u91cf,\u50cf\u8f6c\u4e49\u5b57\u7b26.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>ECMAScript\u63d0\u4f9b\u4e86typeof \u8fd0\u7b97\u7b26\u6765\u5224\u65ad\u4e00\u4e2a\u503c\u6216\u53d8\u91cf\u662f\u5426\u5728\u67d0\u79cd\u7c7b\u578b\u7684\u8303\u56f4\u5185\u3002\u53ef\u4ee5\u7528\u8fd9\u4e2a\u8fd0\u7b97\u7b26\u5224\u65ad\u4e00\u4e2a\u503c\u6216\u8005\u53d8\u91cf\u662f\u5426\u8868\u793a\u4e00\u79cd\u539f\u59cb\u7c7b\u578b\uff1a\u5982\u679c\u5b83\u662f\u539f\u59cb\u7c7b\u578b\uff0c\u8fd8\u53ef\u4ee5\u5224\u65ad\u5b83\u8868\u793a\u54ea\u79cd\u539f\u59cb\u7c7b\u578b\u3002<\/p>\n<p>typeof \u8fd0\u7b97\u7b26\u6709\u4e00\u4e2a\u53c2\u6570\uff0c\u5c31\u662f\u8981\u68c0\u67e5\u7684\u53d8\u91cf\u6216\u503c<\/p>\n<p>\u4f8b\u5982: typeof\u00a0 \u53d8\u91cf\u6216\u503c<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u5bf9\u53d8\u91cf\u6216\u503c\u8c03\u7528 typeof \u8fd0\u7b97\u7b26\u5c06\u8fd4\u56de\u4e0b\u5217\u503c\u4e4b\u4e00\uff1a<\/p>\n<p>undefined &#8211; \u5982\u679c\u53d8\u91cf\u662f Undefined \u7c7b\u578b\u7684<\/p>\n<p>boolean &#8211; \u5982\u679c\u53d8\u91cf\u662f Boolean \u7c7b\u578b\u7684<\/p>\n<p>number &#8211; \u5982\u679c\u53d8\u91cf\u662f Number \u7c7b\u578b\u7684<\/p>\n<p>string &#8211; \u5982\u679c\u53d8\u91cf\u662f String \u7c7b\u578b\u7684<\/p>\n<p>object &#8211; \u5982\u679c\u53d8\u91cf\u662f\u4e00\u79cd\u5f15\u7528\u7c7b\u578b\u6216 Null \u7c7b\u578b\u7684<\/p>\n<p>\u6ce8\u610f\uff1a\u60a8\u4e5f\u8bb8\u4f1a\u95ee\uff0c\u4e3a\u4ec0\u4e48 typeof \u8fd0\u7b97\u7b26\u5bf9\u4e8e null \u503c\u4f1a\u8fd4\u56de &#8220;Object&#8221;\u3002\u8fd9\u5b9e\u9645\u4e0a\u662f JavaScript \u6700\u521d\u5b9e\u73b0\u4e2d\u7684\u4e00\u4e2a\u9519\u8bef\uff0c\u7136\u540e\u88ab ECMAScript \u6cbf\u7528\u4e86\u3002\u73b0\u5728\uff0cnull \u88ab\u8ba4\u4e3a\u662f\u5bf9\u8c61\u7684\u5360\u4f4d\u7b26\uff0c\u4ece\u800c\u89e3\u91ca\u4e86\u8fd9\u4e00\u77db\u76fe\uff0c\u4f46\u4ece\u6280\u672f\u4e0a\u6765\u8bf4\uff0c\u5b83\u4ecd\u7136\u662f\u539f\u59cb\u503c\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u5f15\u7528\u7c7b\u578b<\/h3>\n<p>\u5f15\u7528\u7c7b\u578b\u901a\u5e38\u53eb\u505a\u7c7b(class),\u4e5f\u5c31\u662f\u8bf4\uff0c\u9047\u5230\u5f15\u7528\u503c\uff0c\u6240\u5904\u7406\u7684\u5c31\u662f\u5bf9\u8c61\u3002\u4ece\u4f20\u7edf\u610f\u4e49\u4e0a\u6765\u8bf4\uff0cECMAScript \u5e76\u4e0d\u771f\u6b63\u5177\u6709\u7c7b\u3002ECMAScript \u5b9a\u4e49\u4e86\u201c\u5bf9\u8c61\u5b9a\u4e49\u201d\uff0c\u903b\u8f91\u4e0a\u7b49\u4ef7\u4e8e\u5176\u4ed6\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u4e2d\u7684\u7c7b\u3002\u5bf9\u8c61\u662f\u7531 new \u8fd0\u7b97\u7b26\u52a0\u4e0a\u8981\u5b9e\u4f8b\u5316\u7684\u5bf9\u8c61\u7684\u540d\u5b57\u521b\u5efa\u7684<\/p>\n<p>var obj=new Object();<\/p>\n<p>Object\u5bf9\u8c61\u81ea\u8eab\u7528\u5904\u4e0d\u5927\uff0c\u4f46\u662f\u00a0ECMAScript \u4e2d\u7684 Object \u5bf9\u8c61\u4e0e Java \u4e2d\u7684 java.lang.Object \u76f8\u4f3c\uff0cECMAScript \u4e2d\u7684\u6240\u6709\u5bf9\u8c61\u90fd\u7531\u8fd9\u4e2a\u5bf9\u8c61\u7ee7\u627f\u800c\u6765\uff0cObject \u5bf9\u8c61\u4e2d\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u90fd\u4f1a\u51fa\u73b0\u5728\u5176\u4ed6\u5bf9\u8c61\u4e2d<\/p>\n<p>\u5e38\u7528\u7684javascript\u5bf9\u8c61\u6709 Boolean,Number,Array,String,Date,Math,RegExp.<\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528instanceof\u8fd0\u7b97\u7b26\u6765\u5224\u65ad\u5bf9\u8c61\u7684\u7c7b\u578b\u3002<\/p>\n<h2>5.js\u57fa\u7840-\u7c7b\u578b\u8f6c\u6362<\/h2>\n<p>ECMAScript\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u5927\u91cf\u7684\u7c7b\u578b\u8f6c\u6362\u65b9\u6cd5\u3002\u5927\u90e8\u5206\u7c7b\u578b\u5177\u6709\u8fdb\u884c\u7b80\u5355\u8f6c\u6362\u7684\u65b9\u6cd5\uff0c\u8fd8\u6709\u51e0\u4e2a\u5168\u5c40\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u66f4\u590d\u6742\u7684\u8f6c\u6362\u3002\u5e03\u5c14\u503c\u3001\u6570\u5b57\u548c\u5b57\u7b26\u4e32\u7684\u539f\u59cb\u503c\u5b83\u4eec\u662f\u4f2a\u5bf9\u8c61\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u5b9e\u9645\u4e0a\u5177\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<h3>\u00d8\u00a0 \u8f6c\u6362\u6210\u5b57\u7b26\u4e32<\/h3>\n<p>toString()\u65b9\u6cd5.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>true.toString();\u00a0 9.9.toString();<\/p>\n<p>\u6ce8\u610f:<\/p>\n<p>null\u548cundefined\u7c7b\u578b,\u8c03\u7528toString()\u4f1a\u51fa\u9519.<\/p>\n<h3>\u00d8\u00a0 \u8f6c\u6362\u6210\u6570\u5b57<\/h3>\n<p>ECMAScript \u63d0\u4f9b\u4e86\u4e24\u79cd\u628a\u975e\u6570\u5b57\u7684\u539f\u59cb\u503c\u8f6c\u6362\u6210\u6570\u5b57\u7684\u65b9\u6cd5\uff0c\u5373 parseInt() \u548c parseFloat()\u3002\u524d\u8005\u5c1d\u8bd5\u7740\u628a\u503c\u8f6c\u6362\u6210\u6574\u6570\uff0c\u540e\u8005\u5c1d\u8bd5\u8fd9\u628a\u503c\u8f6c\u6362\u6210\u6d6e\u70b9\u6570\u3002\u53ea\u6709\u5bf9 String \u7c7b\u578b\u8c03\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5b83\u4eec\u624d\u80fd\u6b63\u786e\u8fd0\u884c\uff1b\u5bf9\u5176\u4ed6\u7c7b\u578b\u8fd4\u56de\u7684\u90fd\u662f NaN\u3002<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>alert(parseInt(\u201c9.9\u201d));\/\/9<\/p>\n<p>alert(typeof parseInt(\u201c9.9\u201d)); \/\/number<\/p>\n<p>&nbsp;<\/p>\n<p>alert(parseFloat(\u201c9.9.8hello\u201d)); \/\/9.9<\/p>\n<p>alert(typeof parseFloat(\u201c9.9.8hello\u201d)); \/\/number<\/p>\n<h3>\u00d8\u00a0 \u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/h3>\n<p>\u4f7f\u7528\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u53ef\u4ee5\u8bbf\u95ee\u7279\u5b9a\u7684\u503c\u3002ECMAScript\u00a0\u4e2d\u63d0\u4f9b\u4e86\u4e09\u79cd\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a<\/p>\n<ul>\n<li>\u628a\u7ed9\u5b9a\u7684\u503c\u8f6c\u6362\u6210Boolean\u7c7b\u578b<\/li>\n<li>\u628a\u7ed9\u5b9a\u7684\u503c\u8f6c\u6362\u6210\u6570\u5b57<\/li>\n<li>\u628a\u7ed9\u5b9a\u7684\u503c\u8f6c\u6362\u6210\u5b57\u7b26\u4e32<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>\u6d4b\u8bd5Boolean\u578b\u7684\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/p>\n<p>alert(Boolean(undefined));\/\/false<\/p>\n<p>&nbsp;<\/p>\n<p>alert(Boolean(null));\/\/false<\/p>\n<p>alert(Boolean(new Object));\/\/true<\/p>\n<p>&nbsp;<\/p>\n<p>alert(Boolean(&#8220;&#8221;));\/\/false<\/p>\n<p>alert(Boolean(&#8220;hello&#8221;));\/\/true<\/p>\n<p>&nbsp;<\/p>\n<p>alert(Boolean(0));\/\/false<\/p>\n<p>alert(Boolean(2));\u00a0\u00a0 \/\/true<\/p>\n<p>\u975e\u7a7a\u5bf9\u8c61,\u975e\u7a7a\u5b57\u7b26\u4e32,\u975e\u96f6\u6570\u5b57\u7ed3\u679c\u90fd\u4e3atrue;\u5176\u4f59\u4e3afalse<\/p>\n<p>&nbsp;<\/p>\n<p>\u6d4b\u8bd5\u5f3a\u5236\u8f6c\u6362\u6210\u6570\u5b57\u7c7b\u578b<\/p>\n<p>alert(Number(&#8220;&#8221;));<\/p>\n<p>alert(Number(&#8221; &#8220;));<\/p>\n<p>alert(Number(&#8220;9&#8221;));<\/p>\n<p>alert(Number(&#8220;9.9&#8221;));<\/p>\n<p>alert(Number(null));<\/p>\n<p>alert(Number(true));<\/p>\n<p>alert(Number(false));<\/p>\n<p>&nbsp;<\/p>\n<p>alert(Number(&#8220;9kuai9&#8221;));<\/p>\n<p>alert(Number(&#8220;chaoshi&#8221;));<\/p>\n<p>alert(Number(new Object()));<\/p>\n<p>alert(Number(undefined));<\/p>\n<p>&nbsp;<\/p>\n<p>\u6d4b\u8bd5\u5f3a\u5236\u8f6c\u6362\u6210\u5b57\u7b26\u4e32<\/p>\n<p>alert(String(null));<\/p>\n<p>alert(String(undefined));<\/p>\n<p>alert(String(50));<\/p>\n<p>alert(String(true));<\/p>\n<h2>6.js\u57fa\u7840-\u8fd0\u7b97\u7b26\u4e0e\u8868\u8fbe\u5f0f<\/h2>\n<p>ECMAScript \u8fd0\u7b97\u7b26\u5206\u7c7b\uff1a<\/p>\n<p>\u4e00\u5143\u8fd0\u7b97\u7b26<\/p>\n<p>\u4f4d\u8fd0\u7b97\u7b26<\/p>\n<p>\u903b\u8f91\u8fd0\u7b97\u7b26<\/p>\n<p>\u7b97\u672f\u8fd0\u7b97\u7b26<\/p>\n<p>\u5173\u7cfb\u8fd0\u7b97\u7b26<\/p>\n<p>\u7b49\u6027\u8fd0\u7b97\u7b26<\/p>\n<p>\u6761\u4ef6\u8fd0\u7b97\u7b26(\u4e09\u76ee)<\/p>\n<p>\u8d4b\u503c\u8fd0\u7b97\u7b26<\/p>\n<p>\u9017\u53f7\u8fd0\u7b97\u7b26<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u4e00\u5143\u8fd0\u7b97\u7b26<\/h3>\n<ul>\n<li>delete<\/li>\n<\/ul>\n<p>delete \u8fd0\u7b97\u7b26\u5220\u9664\u5bf9\u4ee5\u524d\u5b9a\u4e49\u7684\u5bf9\u8c61\u5c5e\u6027\u6216\u65b9\u6cd5\u7684\u5f15\u7528\u3002<\/p>\n<p>\u9762\u5bf9\u5bf9\u8c61\u4e2d\u53ef\u80fd\u4f7f\u7528\uff0c\u5728JS\u6846\u67b6\u6709\u6d89\u53ca\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u4e0d\u4f7f\u7528\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"572\">var o = new Object;<\/p>\n<p>o.name = &#8220;David&#8221;;<\/p>\n<p>alert(o.name); \/\/\u8f93\u51fa &#8220;David&#8221;<\/p>\n<p>delete o.name;<\/p>\n<p>alert(o.name); \/\/\u8f93\u51fa &#8220;undefined&#8221;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6ce8\u610f\uff1adelete \u8fd0\u7b97\u7b26\u4e0d\u80fd\u5220\u9664\u5f00\u53d1\u8005\u672a\u5b9a\u4e49\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u5c06\u5f15\u53d1\u9519\u8bef\uff1adelete o.toString;<\/p>\n<ul>\n<li>void (\u51fd\u6570\u65f6\u4f7f\u7528)<\/li>\n<\/ul>\n<p>void \u8fd0\u7b97\u7b26\u5bf9\u4efb\u4f55\u503c\u8fd4\u56de undefined\u3002\u8be5\u8fd0\u7b97\u7b26\u901a\u5e38\u7528\u4e8e\u907f\u514d\u8f93\u51fa\u4e0d\u5e94\u8be5\u8f93\u51fa\u7684\u503c\uff0c\u4f8b\u5982\uff0c\u4ece HTML \u7684 &lt;a&gt; \u5143\u7d20\u8c03\u7528 JavaScript \u51fd\u6570\u65f6\u3002\u8981\u6b63\u786e\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u51fd\u6570\u4e0d\u80fd\u8fd4\u56de\u6709\u6548\u503c\uff0c\u5426\u5219\u6d4f\u89c8\u5668\u5c06\u6e05\u7a7a\u9875\u9762\uff0c\u53ea\u663e\u793a\u51fd\u6570\u7684\u7ed3\u679c<\/p>\n<p>\u9700\u6c42\uff1a\u70b9\u51fb\u8d85\u94fe\u63a5\uff0c\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u7a97\u53e3<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"547\">\u6b63\u786e\u7f16\u5199\uff1a<\/p>\n<p>&lt;a href=&#8221;javascript:void(window.open(&#8216;about:blank&#8217;))&#8221;&gt;Click me&lt;\/a&gt;<\/p>\n<p>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td width=\"547\">\u9519\u8bef\u7f16\u5199\uff1a<\/p>\n<p>&lt;a href=&#8221;javascript:window.open(&#8216;about:blank&#8217;)&#8221;&gt;Click me&lt;\/a&gt;<\/p>\n<p>\u73b0\u8c61\uff1a\u70b9\u51fb\u94fe\u63a5\uff0c\u5c4f\u5e55\u4e0a\u663e\u793a &#8220;[object]&#8221;\u3002<\/p>\n<p>\u5206\u6790\uff1awindow.open() \u65b9\u6cd5\u8fd4\u56de\u4e86\u65b0\u6253\u5f00\u7684\u7a97\u53e3\u7684\u5f15\u7528\u3002\u7136\u540e\u8be5\u5bf9\u8c61\u5c06\u88ab\u8f6c\u6362\u6210\u8981\u663e\u793a\u7684\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>++\u548c&#8211;<\/li>\n<li>\u4e00\u5143\u52a0\u6cd5\u548c\u4e00\u5143\u51cf\u6cd5<\/li>\n<\/ul>\n<p>\u4e00\u5143\u52a0\u6cd5\u6570\u5b57\u65e0\u4efb\u4f55\u5f71\u54cd\uff1a<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"552\">var iNum = 20;<\/p>\n<p>iNum = +iNum;<\/p>\n<p>alert(iNum);\u00a0\u00a0 \/\/\u8f93\u51fa &#8220;20&#8221;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f46\u5bf9\u5b57\u7b26\u4e32\u5374\u6709\u6709\u8da3\u7684\u6548\u679c\uff0c\u4f1a\u628a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6570\u5b57\u3002<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"555\">var sNum = &#8220;20&#8221;;<\/p>\n<p>alert(typeof sNum);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u8f93\u51fa &#8220;string&#8221;<\/p>\n<p>var iNum = +sNum;<\/p>\n<p>alert(typeof iNum); \/\/\u8f93\u51fa &#8220;number&#8221;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5f53\u4e00\u5143\u52a0\u6cd5\u8fd0\u7b97\u7b26\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u5b83\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\u4e0e parseInt() \u76f8\u4f3c\uff0c\u4e3b\u8981\u7684\u4e0d\u540c\u662f\u53ea\u6709\u5bf9\u4ee5 &#8220;0x&#8221; \u5f00\u5934\u7684\u5b57\u7b26\u4e32\uff08\u8868\u793a\u5341\u516d\u8fdb\u5236\u6570\u5b57\uff09\uff0c\u4e00\u5143\u8fd0\u7b97\u7b26\u624d\u80fd\u628a\u5b83\u8f6c\u6362\u6210\u5341\u8fdb\u5236\u7684\u503c\u3002\u56e0\u6b64\uff0c\u7528\u4e00\u5143\u52a0\u6cd5\u8f6c\u6362 &#8220;010&#8221;\uff0c\u5f97\u5230\u7684\u603b\u662f 10\uff0c\u800c &#8220;0xB&#8221; \u5c06\u88ab\u8f6c\u6362\u6210 11\u3002<\/p>\n<p>\u4e00\u5143\u51cf\u6cd5\u5c31\u662f\u5bf9\u6570\u503c\u6c42\u8d1f\uff08\u4f8b\u5982\u628a 20 \u8f6c\u6362\u6210 -20\uff09\uff1a<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"555\">var iNum = 20;<\/p>\n<p>iNum = -iNum;<\/p>\n<p>alert(iNum);\u00a0\u00a0 \/\/\u8f93\u51fa &#8220;-20&#8221;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u4f4d\u8fd0\u7b97\u7b26<\/h3>\n<p>| &amp; ~ &gt;&gt; &gt;&gt;&gt; &lt;&lt;<\/p>\n<p>ECMAScript \u6574\u6570\u6709\u4e24\u79cd\u7c7b\u578b\uff0c\u5373\u6709\u7b26\u53f7\u6574\u6570\uff08\u5141\u8bb8\u7528\u6b63\u6570\u548c\u8d1f\u6570\uff09\u548c\u65e0\u7b26\u53f7\u6574\u6570\uff08\u53ea\u5141\u8bb8\u7528\u6b63\u6570\uff09\u3002\u5728 ECMAScript \u4e2d\uff0c\u6240\u6709\u6574\u6570\u5b57\u9762\u91cf\u9ed8\u8ba4\u90fd\u662f\u6709\u7b26\u53f7\u6574\u6570(32\u4f4d).\u548cjava\u57fa\u672c\u4e00\u6837.<\/p>\n<h3>\u00d8\u00a0 \u903b\u8f91\u8fd0\u7b97\u7b26 &amp;&amp;\u00a0 ||\u00a0 !<\/h3>\n<p>&nbsp;<\/p>\n<h4>u ! (not\u8fd0\u7b97\u7b26)<\/h4>\n<ul>\n<li>!\u8fd0\u7b97\u7b26\u8fd4\u56de\u7684\u4e00\u5b9a\u662f Boolean \u503c\u3002<\/li>\n<li>!\u8fd0\u7b97\u7b26\u7684\u884c\u4e3a\u5982\u4e0b\uff1a<\/li>\n<\/ul>\n<p>\u5982\u679c\u8fd0\u7b97\u6570\u662f\u5bf9\u8c61\uff0c\u8fd4\u56de false<\/p>\n<p>\u5982\u679c\u8fd0\u7b97\u6570\u662f\u6570\u5b57 0\uff0c\u8fd4\u56de true<\/p>\n<p>\u5982\u679c\u8fd0\u7b97\u6570\u662f 0 \u4ee5\u5916\u7684\u4efb\u4f55\u6570\u5b57\uff0c\u8fd4\u56de false<\/p>\n<p>\u5982\u679c\u8fd0\u7b97\u6570\u662f null\uff0c\u8fd4\u56de true<\/p>\n<p>\u5982\u679c\u8fd0\u7b97\u6570\u662f NaN\uff0c\u8fd4\u56de true<\/p>\n<p>\u5982\u679c\u8fd0\u7b97\u6570\u662f undefined\uff0c\u8fd4\u56detrue<\/p>\n<p>&nbsp;<\/p>\n<h4>u &amp;&amp;<\/h4>\n<p>&amp;&amp;\u8fd0\u7b97\u7684\u8fd0\u7b97\u6570\u53ef\u4ee5\u662f\u4efb\u4f55\u7c7b\u578b\u7684.<\/p>\n<ul>\n<li>\u5982\u679c\u8fd0\u7b97\u6570\u90fd\u662fboolean\u7c7b\u578b,\u548cjava\u4e00\u6837\u3002<\/li>\n<li>\u5982\u679c\u67d0\u4e2a\u8fd0\u7b97\u6570\u4e0d\u662f\u539f\u59cb\u7684 Boolean \u578b\u503c\uff0c&amp;&amp;\u8fd0\u7b97\u5e76\u4e0d\u4e00\u5b9a\u8fd4\u56de Boolean \u503c<\/li>\n<\/ul>\n<p>\u4f8b\u5982:<\/p>\n<p>alert(false&amp;&amp;&#8221;abc&#8221;);\/\/false<\/p>\n<p>alert(true&amp;&amp;&#8221;abc&#8221;);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/abc<\/p>\n<p>alert(&#8220;abc&#8221;&amp;&amp;true);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/true<\/p>\n<p>alert(&#8220;abc&#8221;&amp;&amp;false);\/\/false<\/p>\n<p>alert(&#8220;abc&#8221;&amp;&amp;&#8221;bcd&#8221;);\/\/bcd<\/p>\n<p>alert(null&amp;&amp;true);\/\/null<\/p>\n<p>alert(NaN &amp;&amp; true);\/\/NaN<\/p>\n<p>alert(NaN&amp;&amp;null);\/\/NaN<\/p>\n<p>alert(null&amp;&amp;NaN);\/\/null<\/p>\n<p>alert(undefined&amp;&amp;true);\/\/undefined<\/p>\n<p>alert(false&amp;&amp;undefined);\/\/false<\/p>\n<p>alert(undefined&amp;&amp;undefined);\/\/undefined<\/p>\n<p>\u7ed3\u8bba:<\/p>\n<p>\u4e00\u65e6\u524d\u9762\u7684\u8868\u8fbe\u5f0f\u80fd\u786e\u5b9a\u4e86\u6700\u7ec8\u7ed3\u679c,\u90a3\u4e48\u6700\u7ec8\u7684\u7ed3\u679c,\u5c31\u662f\u80fd\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c,\u540e\u9762\u7684\u8868\u8fbe\u5f0f\u4e5f\u4e0d\u518d\u8fdb\u884c\u8fd0\u7b97\u4e86.\u5426\u5219,\u6700\u7ec8\u7ed3\u679c\u4e3a\u6700\u540e\u9762\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c.<\/p>\n<p>&nbsp;<\/p>\n<h4>u ||<\/h4>\n<p>||\u8fd0\u7b97\u7684\u8fd0\u7b97\u6570\u53ef\u4ee5\u662f\u4efb\u4f55\u7c7b\u578b\u7684\uff0c<\/p>\n<ul>\n<li>\u5982\u679c\u90fd\u662fboolean\u7c7b\u578b,\u548cjava\u4e00\u6837\u3002<\/li>\n<li>\u5982\u679c\u67d0\u4e2a\u8fd0\u7b97\u6570\u4e0d\u662f\u539f\u59cb\u7684 Boolean \u578b\u503c\uff0c||\u8fd0\u7b97\u5e76\u4e0d\u4e00\u5b9a\u8fd4\u56de Boolean \u503c<\/li>\n<\/ul>\n<p>\u4f8b\u5982:<\/p>\n<p>alert(false||&#8221;abc&#8221;);\/\/abc<\/p>\n<p>alert(true||&#8221;abc&#8221;);\/\/true<\/p>\n<p>alert(&#8220;abc&#8221;||false);\/\/abc<\/p>\n<p>alert(&#8220;abc&#8221;||true);\u00a0\u00a0\u00a0 \/\/abc<\/p>\n<p>alert(&#8220;abc&#8221;||&#8221;bcd&#8221;);\/\/abc<\/p>\n<p>alert(null||false);\u00a0\u00a0\u00a0\u00a0 \/\/false<\/p>\n<p>alert(null||true);\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/true<\/p>\n<p>alert(null||undefined);\/\/undefined<\/p>\n<p>alert(undefined||null);\/\/null<\/p>\n<p>alert(undefined||undefined);\/\/undefined<\/p>\n<p>alert(NaN||true);\/\/true<\/p>\n<p>alert(NaN||false);\/\/false<\/p>\n<p>alert(NaN||NaN);\/\/nan<\/p>\n<p>alert(NaN||null);\/\/null<\/p>\n<p>\u7ed3\u8bba:<\/p>\n<p>\u4e00\u65e6\u524d\u9762\u7684\u8868\u8fbe\u5f0f\u80fd\u786e\u5b9a\u4e86\u6700\u7ec8\u7ed3\u679c,\u90a3\u4e48\u6700\u7ec8\u7684\u7ed3\u679c,\u5c31\u662f\u80fd\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c,\u540e\u9762\u7684\u8868\u8fbe\u5f0f\u4e5f\u4e0d\u518d\u8fdb\u884c\u8fd0\u7b97\u4e86.\u5426\u5219,\u6700\u7ec8\u7ed3\u679c\u4e3a\u6700\u540e\u9762\u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c.<\/p>\n<h3>\u00d8\u00a0 \u7b97\u672f\u8fd0\u7b97\u7b26<\/h3>\n<p>+-*\/% \u4e0ejava\u57fa\u672c\u76f8\u540c<\/p>\n<p>&nbsp;<\/p>\n<h4>u \u52a0\u6cd5\u7279\u6b8a\u884c\u4e3a<\/h4>\n<ul>\n<li>\u67d0\u4e2a\u8fd0\u7b97\u6570\u662f NaN\uff0c\u90a3\u4e48\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>-Infinity \u52a0 -Infinity\uff0c\u7ed3\u679c\u4e3a -Infinity\u3002<\/li>\n<li>Infinity \u52a0 -Infinity\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>+0 \u52a0 +0\uff0c\u7ed3\u679c\u4e3a +0\u3002<\/li>\n<li>-0 \u52a0 +0\uff0c\u7ed3\u679c\u4e3a +0\u3002<\/li>\n<li>-0 \u52a0 -0\uff0c\u7ed3\u679c\u4e3a -0\u3002<\/li>\n<li>\u4e0d\u8fc7\uff0c\u5982\u679c\u67d0\u4e2a\u8fd0\u7b97\u6570\u662f\u5b57\u7b26\u4e32\uff0c\u90a3\u4e48\u91c7\u7528\u4e0b\u5217\u89c4\u5219\uff1a<\/li>\n<\/ul>\n<p>\u5982\u679c\u4e24\u4e2a\u8fd0\u7b97\u6570\u90fd\u662f\u5b57\u7b26\u4e32\uff0c\u628a\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u5230\u7b2c\u4e00\u4e2a\u4e0a\u3002<\/p>\n<p>\u5982\u679c\u53ea\u6709\u4e00\u4e2a\u8fd0\u7b97\u6570\u662f\u5b57\u7b26\u4e32\uff0c\u628a\u53e6\u4e00\u4e2a\u8fd0\u7b97\u6570\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\uff0c\u7ed3\u679c\u662f\u4e24\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u6210\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h4>u \u51cf\u6cd5\u7279\u6b8a\u884c\u4e3a<\/h4>\n<ul>\n<li>\u67d0\u4e2a\u8fd0\u7b97\u6570\u662f NaN\uff0c\u90a3\u4e48\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>-Infinity \u51cf Infinity\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>-Infinity \u51cf -Infinity\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u51cf -Infinity\uff0c\u7ed3\u679c\u4e3a Infinity\u3002<\/li>\n<li>-Infinity \u51cf Infinity\uff0c\u7ed3\u679c\u4e3a -Infinity\u3002<\/li>\n<li>+0 \u51cf +0\uff0c\u7ed3\u679c\u4e3a +0\u3002<\/li>\n<li>-0 \u51cf -0\uff0c\u7ed3\u679c\u4e3a -0\u3002<\/li>\n<li>+0 \u51cf -0\uff0c\u7ed3\u679c\u4e3a +0\u3002<\/li>\n<li>\u67d0\u4e2a\u8fd0\u7b97\u7b26\u4e0d\u662f\u6570\u5b57\uff0c\u90a3\u4e48\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<\/ul>\n<h4>u \u4e58\u6cd5\u7279\u6b8a\u884c\u4e3a<\/h4>\n<ul>\n<li>\u5982\u679c\u7ed3\u679c\u592a\u5927\u6216\u592a\u5c0f\uff0c\u90a3\u4e48\u751f\u6210\u7684\u7ed3\u679c\u662f Infinity \u6216 -Infinity\u3002<\/li>\n<li>\u5982\u679c\u67d0\u4e2a\u8fd0\u7b97\u6570\u662f NaN\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u4e58\u4ee5 0\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u4e58\u4ee5 0 \u4ee5\u5916\u7684\u4efb\u4f55\u6570\u5b57\uff0c\u7ed3\u679c\u4e3a Infinity \u6216 -Infinity\u3002<\/li>\n<li>Infinity \u4e58\u4ee5 Infinity\uff0c\u7ed3\u679c\u4e3a Infinity\u3002<\/li>\n<\/ul>\n<h4>u \u9664\u6cd5\u7279\u6b8a\u884c\u4e3a<\/h4>\n<ul>\n<li>\u5982\u679c\u7ed3\u679c\u592a\u5927\u6216\u592a\u5c0f\uff0c\u90a3\u4e48\u751f\u6210\u7684\u7ed3\u679c\u662f Infinity \u6216 -Infinity\u3002<\/li>\n<li>\u5982\u679c\u67d0\u4e2a\u8fd0\u7b97\u6570\u662f NaN\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u88ab Infinity \u9664\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u88ab\u4efb\u4f55\u6570\u5b57\u9664\uff0c\u7ed3\u679c\u4e3a Infinity\u3002<\/li>\n<li>0 \u9664\u4e00\u4e2a\u4efb\u4f55\u975e\u65e0\u7a77\u5927\u7684\u6570\u5b57\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u88ab 0 \u4ee5\u5916\u7684\u4efb\u4f55\u6570\u5b57\u9664\uff0c\u7ed3\u679c\u4e3a Infinity \u6216 -Infinity\u3002<\/li>\n<\/ul>\n<h4>u \u53d6\u6a21\uff08\u4f59\uff09\u7279\u6b8a\u884c\u4e3a<\/h4>\n<ul>\n<li>\u5982\u679c\u88ab\u9664\u6570\u662f Infinity\uff0c\u6216\u9664\u6570\u662f 0\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>Infinity \u88ab Infinity \u9664\uff0c\u7ed3\u679c\u4e3a NaN\u3002<\/li>\n<li>\u5982\u679c\u9664\u6570\u662f\u65e0\u7a77\u5927\u7684\u6570\uff0c\u7ed3\u679c\u4e3a\u88ab\u9664\u6570\u3002<\/li>\n<li>\u5982\u679c\u88ab\u9664\u6570\u4e3a 0\uff0c\u7ed3\u679c\u4e3a 0\u3002<\/li>\n<\/ul>\n<h3>\u00d8\u00a0 \u5173\u7cfb\u8fd0\u7b97\u7b26<\/h3>\n<p>\u5173\u7cfb\u8fd0\u7b97\u7b26\u6709&gt;,&lt;, &gt;=, &lt;= ,\u5b83\u4eec\u7684\u8fd0\u7b97\u7ed3\u679c\u8fd4\u56de\u7684\u662f\u4e00\u4e2aboolean\u503c<\/p>\n<p>\u6570\u5b57\u6bd4\u8f83:\u00a0\u00a0\u00a0\u00a0\u00a0 \u548cjava\u4e00\u6837<\/p>\n<p>\u5b57\u7b26\u4e32\u6bd4\u8f83:\u00a0\u00a0 ASCII\u5927\u5c0f\u8fdb\u884c\u6bd4\u8f83,\u533a\u5206\u5927\u5c0f\u5199<\/p>\n<p>\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u6570\u5b57\u548c\u6570\u5b57\u6bd4\u8f83:\u00a0\u00a0 \u5b57\u7b26\u4e32\u6570\u5b57\u8f6c\u6210\u6570\u5b57,\u7136\u540e\u6bd4\u8f83\u5927\u5c0f<\/p>\n<p>\u5b57\u7b26\u4e32\u548c\u6570\u5b57\u6bd4\u8f83:\u00a0\u00a0\u00a0\u00a0\u00a0 \u5b57\u7b26\u4e32\u65e0\u6cd5\u8f6c\u6210\u6570\u5b57,\u5b57\u7b26\u4e32\u5c06\u8f6c\u6210NaN,\u6700\u7ec8\u7ed3\u679c\u4e3afalse<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u7b49\u6027\u8fd0\u7b97\u7b26<\/h3>\n<p>\u5728 ECMAScript \u4e2d\uff0c\u7b49\u53f7\u7531\u53cc\u7b49\u53f7\uff08==\uff09\u8868\u793a\uff0c\u5f53\u4e14\u4ec5\u5f53\u4e24\u4e2a\u8fd0\u7b97\u6570\u76f8\u7b49\u65f6\uff0c\u5b83\u8fd4\u56de true\u3002\u975e\u7b49\u53f7\u7531\u611f\u53f9\u53f7\u52a0\u7b49\u53f7\uff08!=\uff09\u8868\u793a\uff0c\u5f53\u4e14\u4ec5\u5f53\u4e24\u4e2a\u8fd0\u7b97\u6570\u4e0d\u76f8\u7b49\u65f6\uff0c\u5b83\u8fd4\u56de true\u3002\u4e3a\u786e\u5b9a\u4e24\u4e2a\u8fd0\u7b97\u6570\u662f\u5426\u76f8\u7b49\uff0c\u8fd9\u4e24\u4e2a\u8fd0\u7b97\u7b26\u90fd\u4f1a\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n<p>\u89c4\u5219:<\/p>\n<ul>\n<li>\u503c null \u548c undefined \u76f8\u7b49\u3002<\/li>\n<li>\u5728\u68c0\u67e5\u76f8\u7b49\u6027\u65f6\uff0c\u4e0d\u80fd\u628a null \u548c undefined \u8f6c\u6362\u6210\u5176\u4ed6\u503c\u3002<\/li>\n<li>\u5982\u679c\u67d0\u4e2a\u8fd0\u7b97\u6570\u662f NaN\uff0c\u7b49\u53f7\u5c06\u8fd4\u56de false\uff0c\u975e\u7b49\u53f7\u5c06\u8fd4\u56de true\u3002<\/li>\n<li>\u5982\u679c\u4e24\u4e2a\u8fd0\u7b97\u6570\u90fd\u662f\u5bf9\u8c61\uff0c\u90a3\u4e48\u6bd4\u8f83\u7684\u662f\u5b83\u4eec\u7684\u5f15\u7528\u503c\u3002\u5982\u679c\u4e24\u4e2a\u8fd0\u7b97\u6570\u6307\u5411\u540c\u4e00\u5bf9\u8c61\uff0c\u90a3\u4e48\u7b49\u53f7\u8fd4\u56de true\uff0c\u5426\u5219\u4e24\u4e2a\u8fd0\u7b97\u6570\u4e0d\u7b49\u3002<\/li>\n<li>\u5373\u4f7f\u4e24\u4e2a\u6570\u90fd\u662f NaN\uff0c\u7b49\u53f7\u4ecd\u7136\u8fd4\u56de false\uff0c\u56e0\u4e3a\u6839\u636e\u89c4\u5219\uff0cNaN \u4e0d\u7b49\u4e8e NaN<\/li>\n<li>\u5982\u679c\u4e00\u4e2a\u8fd0\u7b97\u6570\u662f Boolean \u503c\uff0c\u5728\u68c0\u67e5\u76f8\u7b49\u6027\u4e4b\u524d\uff0c\u628a\u5b83\u8f6c\u6362\u6210\u6570\u5b57\u503c\u3002false \u8f6c\u6362\u6210 0\uff0ctrue \u4e3a 1\u3002<\/li>\n<li>\u5982\u679c\u4e00\u4e2a\u8fd0\u7b97\u6570\u662f\u5b57\u7b26\u4e32\uff0c\u53e6\u4e00\u4e2a\u662f\u6570\u5b57\uff0c\u5728\u68c0\u67e5\u76f8\u7b49\u6027\u4e4b\u524d\uff0c\u8981\u5c1d\u8bd5\u628a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6570\u5b57\u3002<\/li>\n<li>\u5982\u679c\u4e00\u4e2a\u8fd0\u7b97\u6570\u662f\u5bf9\u8c61\uff0c\u53e6\u4e00\u4e2a\u662f\u5b57\u7b26\u4e32\uff0c\u5728\u68c0\u67e5\u76f8\u7b49\u6027\u4e4b\u524d\uff0c\u8981\u5c1d\u8bd5\u628a\u5bf9\u8c61\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u5982\u679c\u4e00\u4e2a\u8fd0\u7b97\u6570\u662f\u5bf9\u8c61\uff0c\u53e6\u4e00\u4e2a\u662f\u6570\u5b57\uff0c\u5728\u68c0\u67e5\u76f8\u7b49\u6027\u4e4b\u524d\uff0c\u8981\u5c1d\u8bd5\u628a\u5bf9\u8c61\u8f6c\u6362\u6210\u6570\u5b57\u3002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>alert(null == undefined)<\/p>\n<p>alert(&#8220;NaN&#8221; == NaN)<\/p>\n<p>alert(5 == NaN)<\/p>\n<p>alert(NaN == NaN)<\/p>\n<p>alert(NaN != NaN)<\/p>\n<p>alert(false == 0)<\/p>\n<p>alert(true == 1)<\/p>\n<p>alert(true == 2)<\/p>\n<p>alert(undefined == 0)<\/p>\n<p>alert(null == 0)<\/p>\n<p>alert(&#8220;5&#8221; == 5)<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>\u5168\u7b49\u53f7\u548c\u975e\u5168\u7b49\u53f7<\/p>\n<p>\uf06c\u00a0\u00a0\u00a0 \u4e24\u4e2a\u8fd0\u7b97\u7b26\u6240\u505a\u7684\u4e0e\u7b49\u53f7\u548c\u975e\u7b49\u53f7\u76f8\u540c\uff0c\u53ea\u662f\u5b83\u4eec\u5728\u68c0\u67e5\u76f8\u7b49\u6027\u524d\uff0c\u4e0d\u6267\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n<p>\u5168\u7b49\u53f7\u7531\u4e09\u4e2a\u7b49\u53f7\u8868\u793a\uff08===\uff09\uff0c\u53ea\u6709\u5728\u65e0\u9700\u7c7b\u578b\u8f6c\u6362\u8fd0\u7b97\u6570\u5c31\u76f8\u7b49\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u8fd4\u56de true\u3002<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>var sNum = &#8220;66&#8221;;<\/p>\n<p>var iNum = 66;<\/p>\n<p>alert(sNum == iNum);<\/p>\n<p>alert(sNum === iNum);<\/p>\n<p>&nbsp;<\/p>\n<p>\u975e\u5168\u7b49\u53f7\u7531\u611f\u53f9\u53f7\u52a0\u4e24\u4e2a\u7b49\u53f7\uff08!==\uff09\u8868\u793a\uff0c\u53ea\u6709\u5728\u65e0\u9700\u7c7b\u578b\u8f6c\u6362\u8fd0\u7b97\u6570\u4e0d\u76f8\u7b49\u7684\u60c5\u51b5\u4e0b\uff0c\u624d\u8fd4\u56de true\u3002<\/p>\n<p>var sNum = &#8220;66&#8221;;<\/p>\n<p>var iNum = 66;<\/p>\n<p>alert(sNum != iNum);\u00a0\u00a0\u00a0 \/\/\u8f93\u51fa &#8220;false&#8221;<\/p>\n<p>alert(sNum !== iNum);\u00a0 \/\/\u8f93\u51fa &#8220;true&#8221;<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 \u6761\u4ef6\u8fd0\u7b97\u7b26(\u4e09\u76ee\u8fd0\u7b97\u7b26)<\/h3>\n<p>\u548cjava\u4e2d\u76f8\u540c<\/p>\n<h3>\u00d8\u00a0 \u8d4b\u503c\u8fd0\u7b97\u7b26<\/h3>\n<p>= += -= *= \/=\u7b49\u548cjava\u4e2d\u76f8\u540c<\/p>\n<h3>\u00d8\u00a0 \u9017\u53f7\u8fd0\u7b97\u7b26<\/h3>\n<p>\u7528\u9017\u53f7\u8fd0\u7b97\u7b26\u53ef\u4ee5\u5728\u4e00\u6761\u8bed\u53e5\u4e2d\u6267\u884c\u591a\u4e2a\u8fd0\u7b97\u3002<\/p>\n<p>var iNum1 = 1, iNum = 2, iNum3 = 3;<\/p>\n<p>\u9017\u53f7\u8fd0\u7b97\u7b26\u5e38\u7528\u53d8\u91cf\u58f0\u660e\u4e2d\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>7.js\u57fa\u7840-\u6761\u4ef6\u8bed\u53e5<\/h2>\n<h3>\u00d8\u00a0 if\u8bed\u53e5<\/h3>\n<p>javascrip\u4e2d\u7684if\u8bed\u53e5\uff0c\u4e0e\u6211\u4eec\u5728java\u4e2d\u4f7f\u7528\u57fa\u672c\u76f8\u540c\uff0c<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>if (i &gt; 30) {<\/p>\n<p>alert(&#8220;\u5927\u4e8e 30&#8221;);<\/p>\n<p>}else {<\/p>\n<p>alert(&#8220;\u5c0f\u4e8e\u7b49\u4e8e 30&#8221;);<\/p>\n<p>}<\/p>\n<p>&nbsp;<\/p>\n<h3>\u00d8\u00a0 switch\u8bed\u53e5<\/h3>\n<p>switch\u8bed\u53e5\u4e5f\u4e0e\u6211\u4eec\u5728jdk1.7\u4e2d\u4f7f\u7528\u57fa\u672c\u76f8\u540c\uff0c\u5b83\u53ef\u4ee5\u76f4\u63a5\u5224\u65ad\u5b57\u7b26\u4e32\u7c7b\u578b,case\u540e\u9762\u53ef\u4ee5\u8ddf\u53d8\u91cf.<\/p>\n<p>\u4f8b\u5982:<\/p>\n<p>var BLUE = &#8220;blue&#8221;, RED = &#8220;red&#8221;, GREEN\u00a0 = &#8220;green&#8221;;<\/p>\n<p>switch (sColor) {<\/p>\n<p>case BLUE: alert(&#8220;Blue&#8221;);<\/p>\n<p>break;<\/p>\n<p>case RED: alert(&#8220;Red&#8221;);<\/p>\n<p>break;<\/p>\n<p>case GREEN: alert(&#8220;Green&#8221;);<\/p>\n<p>break;<\/p>\n<p>default: alert(&#8220;Other&#8221;);<\/p>\n<p>}<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2>8.js\u57fa\u7840-\u5faa\u73af\u8bed\u53e5<\/h2>\n<p>\u5728javascript\u4e2d\u4e5f\u5b58\u5728\u5faa\u73af\u8bed\u53e5for while do-while\uff0c\u57fa\u672c\u4e0e\u5728java\u4e2d\u4f7f\u7528\u76f8\u540c.<\/p>\n<p>for\u793a\u4f8b<\/p>\n<p>var iCount = 6;<\/p>\n<p>for (var i = 0; i &lt; iCount; i++) {<\/p>\n<p>alert(i);<\/p>\n<p>}<\/p>\n<p>\u6ce8\u610f:\u5728\u58f0\u660e\u53d8\u91cf\u5f52\u6211\u4eec\u4f7f\u7528var<\/p>\n<p>&nbsp;<\/p>\n<p>while\u793a\u4f8b<\/p>\n<p>var i = 0;<\/p>\n<p>while (i &lt; 10) {<\/p>\n<p>i += 2;<\/p>\n<p>}<\/p>\n<p>&nbsp;<\/p>\n<p>do-while\u793a\u4f8b<\/p>\n<p>var i = 0;<\/p>\n<p>do {<\/p>\n<p>i += 2;<\/p>\n<p>} while (i &lt; 10);<\/p>\n<p>\u6ce8\u610f:\u5728while\u540e\u9762\u7684\u5206\u53f7<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00.CSS 1.CSS\u4ecb\u7ecd CSS \u6307\u5c42\u53e0\u6837\u5f0f\u8868 (Cascading\u00a0Style\u00a0Sheets),\u7528\u6765\u5b9a\u4e49\u7f51 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