{"id":4876,"date":"2015-07-30T23:42:17","date_gmt":"2015-07-30T15:42:17","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=4876"},"modified":"2018-01-09T00:38:33","modified_gmt":"2018-01-08T16:38:33","slug":"ie7-css-js-improvement-change","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2015\/07\/ie7-css-js-improvement-change\/","title":{"rendered":"\u4e86\u4e0d\u8d77\u7684IE7\u6d4f\u89c8\u5668-CSS\u65b0\u7279\u6027-\u5b9e\u73b0\u4e0e\u601d\u7ef4\u53d8\u9769"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=4876<\/a><\/p>\n

\u4e00\u3001\u4e0d\u4ec5\u4ec5\u662fIE7\u6d4f\u89c8\u5668<\/h3>\n

\u672c\u6587\u6240\u5c55\u793a\u7684\u4e00\u7cfb\u5217\u7279\u6027\uff0c\u4ee5\u53ca\u4e00\u4e9b\u601d\u7ef4\u65b9\u5f0f\u7684\u8f6c\u53d8\u4e0d\u4ec5\u9002\u7528\u4e8eIE7\u6d4f\u89c8\u5668\uff0c\u5982\u679c\u4f60\u7684\u9879\u76ee\u53ea\u9700\u8981\u517c\u5bb9IE9+\uff0c\u6216\u8005\u4f60\u76f4\u63a5\u6363\u9f13\u79fb\u52a8\u7aef\uff0c\u5176\u5b9e\u90fd\u662f\u9002\u7528\u7684\u3002<\/p>\n

\u9759\u5fc3\u9605\u8bfb\uff0c\u8bf4\u4e0d\u5b9a\u4f1a\u53d1\u73b0\u4e00\u4e9b\u4ee5\u524d\u6ca1\u6ce8\u610f\u7684\u70b9\u3002<\/p>\n

\u867d\u7136\u8bf4\uff0c\u6574\u4e2a\u5927\u4e2d\u56fd\uff0cIE7\u4efd\u989d\u8fdc\u4e0d\u5982IE6\u6d4f\u89c8\u5668\uff0c\u4f46\u662f\uff0c\u6211\u6240\u4ece\u4e8b\u7684\u51e0\u4e2a\u9879\u76ee\uff0cIE6\u7684\u5360\u6709\u7387\u76f8\u5f53\u5c0f\uff0cIE7\u5374\u67096%\u591a\u3002<\/p>\n

\u56e0\u6b64\uff0cIE7\u6d4f\u89c8\u5668\u8fd8\u662f\u9700\u8981\u8003\u91cf\u7684\u3002<\/p>\n

\u4ee5\u524d\u5728\u6211\u8fd8\u9700\u8981\u517c\u5bb9IE6\u6d4f\u89c8\u5668\u7684\u65f6\u5019\uff0c\u6211\u603b\u89c9\u5f97IE6\u548cIE7\u6d4f\u89c8\u5668\u662f\u4e00\u4e2a\u8def\u5b50\u7684\u4e00\u4e2a\u8d27\u8272\uff0c\u5f88\u591abug\u548c\u884c\u4e3a\u8868\u73b0\u662f\u4e00\u81f4\u7684\u3002\u8ba4\u4e3a\uff0c\u8981\u517c\u5bb9IE7\u548c\u517c\u5bb9IE7\u57fa\u672c\u4e0a\u6ca1\u591a\u5927\u5dee\u522b\u3002\u540e\u6765\u6df1\u5165\u5b9e\u8df5\u53d1\u73b0\uff0c\u4e4b\u524d\u7684\u60f3\u6cd5\u6709\u4e9b\u5929\u771f\u4e86\u3002\u5b9e\u9645\u4e0a\uff0cIE7\u6d4f\u89c8\u5668\u4e0b\uff0c\u6211\u4eec\u4e5f\u80fd\u5b9e\u73b0\u5f88\u591a\u597d\u73a9\u4e14\u6709\u4ef7\u503c\u7684\u4e1c\u897f\u3002<\/p>\n

\u4e8c\u3001IE7\u65b0\u652f\u6301\u9009\u62e9\u5668\u4ee5\u53ca\u4f5c\u7528<\/h3>\n

1. \u591a\u7c7b\u9009\u62e9\u5668<\/strong>
\n\u6240\u8c13\u591a\u7c7b\u9009\u62e9\u5668\u6307\u7684\u662f\u7c7b\u4f3c.classA.classB<\/code>\u8fd9\u79cd\u591a\u4e2a\u7c7b\u540d\u5199\u5728\u4e00\u8d77\u7684\u9009\u62e9\u5668\uff0c\u5b9e\u9645\u4e0a\uff0cIE6\u6d4f\u89c8\u5668\u4e5f\u662f\u652f\u6301\u7684\uff0c\u4f46\u662f\u5462\uff1f\u6709bug. .a.c<\/code>\u548c.b.c<\/code>\u8c8c\u4f3c\u4f1a\u51b2\u7a81\uff08\u5e74\u4ee3\u4e45\u8fdc\uff0c75%\u7684\u786e\u4fe1\uff09\uff0c\u597d\u50cf\u662f\u8981\u5199\u6210.c.a<\/code>\u548c.c.b<\/code>.<\/p>\n

IE7\u6d4f\u89c8\u5668\u5927\u5bb6\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u5730\u4f7f\u7528\uff0c\u6ca1\u6709\u4efb\u4f55bug\u5b58\u5728\u3002\u4f46\u662f\u5462\uff0c\u6839\u636e\u6570\u5e74\u524d\u6211\u5728Chrome\u6d4f\u89c8\u5668\u4e0b\u7684\u6d4b\u8bd5\u548c\u5206\u6790\uff0c\u591a\u7c7b\u9009\u62e9\u5668\u662fCSS\u9009\u62e9\u5668\u4e2d\u6027\u80fd\u76f8\u5f53\u4f4e\u4e0b\u7684\u9009\u62e9\u5668\uff0c\u597d\u50cf\u6ca1\u6709\u4e4b\u4e00\u3002\u4f46\u662f\u5462\uff0cCSS\u9009\u62e9\u5668\u672c\u8eab\u5c31\u5f88\u5feb\uff0c\u5bf9\u5427\uff0c1~2\u6beb\u79d2\u7684\u5dee\u5f02\u5176\u5b9e\u5927\u5bb6\u4e5f\u4e0d\u5fc5\u5728\u610f\u3002\u6bd5\u7adf\uff0c\u6ca1\u4eba\u4f1a\u6574\u4e2aCSS\u6587\u4ef6\u5168\u90e8\u90fd\u662f\u591a\u7c7b\u9009\u62e9\u5668\uff0c\u90a3\u5c31\u592a\u50bb\u4e86\uff01<\/p>\n

IE7\u652f\u6301\u591a\u7c7b\u9009\u62e9\u5668\uff0c\u4f7f\u5f97\u6211\u4eec\u5728CSS\u6784\u5efa\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u4f7f\u7528\u72b6\u6001\u7c7b\u540d\u5bf9\u6574\u4e2a\u9879\u76ee\u8fdb\u884c\u63a7\u5236\u3002<\/p>\n

\u6240\u8c13\u72b6\u6001\u7c7b\u540d\uff0c\u6709\u4e9b\u5bf9\u5e94\u4e8eHTML\u63a7\u4ef6\u4e2d\u7684\u4e00\u4e9b\u5c5e\u6027\uff0c\u4f8b\u5982\uff1a.disabled<\/code>, .checked<\/code>, .active<\/code>, .selected<\/code>. \u5bf9\u7684\uff0c\u8fd9\u4e9b\u7279\u6027\u6574\u7ad9\u901a\u7528\uff0c\u6709\u4e9b\u4eba\u53ef\u80fd\u4f1a\u7591\u95ee\uff0c\u5230\u5904\u4f7f\u7528\uff0c\u4e0d\u6015\u51b2\u7a81\u5417\uff1f<\/p>\n

\u4e0d\u6015\uff0c\u8fd9\u4e9b\u72b6\u6001\u7c7b\u540d\uff0c\u9664\u4e86\u901a\u7528\u7279\u6027\uff0c\u5176\u4f59\u5904\u4e8e\u4e00\u79cd\u8f85\u52a9UI\u7684\u89d2\u8272\uff0c\u9700\u8981\u4e0e\u7279\u5b9a\u573a\u666f\u76f8\u5173\u8054\uff0c\u5e76\u4e0d\u4f1a\u72ec\u7acb\u4f7f\u7528\u3002<\/p>\n

\u4f8b\u5982\uff0c\u6211\u4eec\u9879\u76ee\u4e2d\u6709\u4e24\u79cd\u6309\u94ae\uff0c\u4e00\u79cd\u662f\u7ea2\u8272\uff0c\u4e00\u79cd\u662f\u7eff\u8272\u3002\u7c7b\u540d\u5206\u522b\u662f\uff1a.button_red<\/code>, .button_green<\/code>. \u5728IE6\u5e74\u4ee3\uff0c\u8981\u5b9e\u73b0\u8fd9\u4e24\u79cd\u6309\u94ae\u7684\u7981\u7528\u6001\uff0c\u4e00\u822c\u662f\u4e24\u4e2a\u65b0\u7684\u72ec\u7acb\u7684\u7c7b\u540d\uff1a.button_red_disabled<\/code>, .button_green_disabled<\/code>. \u5bf9\u4e8e\u6309\u94ae\u672c\u8eab\u800c\u8a00\uff0c\u8c8c\u4f3c\u6ca1\u4ec0\u4e48\u95ee\u9898\uff0c\u4f46\u662f\u4ece\u6574\u4e2a\u9879\u76ee\u6765\u770b\uff0c\u6709\u5931\u4f53\u7cfb\u3002<\/p>\n

\u73b0\u5728\uff0cIE7\u652f\u6301\u591a\u7c7b\u9009\u62e9\u5668\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528\u6574\u7ad9\u901a\u7528\u7684.disabled<\/code>\u72b6\u6001\u7c7b\u540d\uff0c\u7ea2\u8272\u548c\u7eff\u8272\u6309\u94ae\u7684\u7981\u7528\u6001\u4e66\u5199\uff0c\u76f4\u63a5\u5c31\u662f\uff1a.button_red.disabled {}<\/code>\u548c.button_green.disabled {}<\/code>. \u7136\u540e\u5176\u4ed6\u4ec0\u4e48\u7981\u7528\uff0c\u6211\u4eec\u5c31\u662f.xxx.disabled<\/code>\u7b49\u3002<\/p>\n

2. \u76f8\u90bb\u7236\u5b50\u9009\u62e9\u5668<\/strong>
\n\u6240\u8c13\u76f8\u90bb\u7236\u5b50\u9009\u62e9\u5668\u6307\u7684\u662f\u7c7b\u4f3c .classA > .classB<\/code>\u8fd9\u79cd\u5199\u6cd5\u7684\u9009\u62e9\u5668\uff0c\u53ea\u4f1a\u63a7\u5236\u4e0b\u4e00\u5c42\u7ea7\u7684\u5143\u7d20\u3002IE6\u6d4f\u89c8\u5668\u652f\u6301\u7684\u9009\u62e9\u5668\u662f\u201c\u540e\u4ee3\u9009\u62e9\u5668\u201d\uff0c\u4e5f\u5c31\u662f\u7c7b\u4f3c.classA .classB<\/code>\uff0c\u4e24\u4e2a\u9009\u62e9\u5668\u4e4b\u95f4\u76f4\u63a5\u662f\u7a7a\u683c\uff0c\u7136\u800c\uff0c\u8fd9\u79cd\u9009\u62e9\u5668\u5728\u9762\u5bf9\u590d\u6742\u573a\u666f\u7684\u65f6\u5019\uff0c\u5bb9\u6613\u6837\u5f0f\u51b2\u7a81\uff0c\u4e0d\u597d\u63a7\u5236\u3002<\/p>\n

\u4f8b\u5982\uff0c\u8fde\u7eed\u7684ul<\/code>,li<\/code>\u5d4c\u5957\uff0c\u5355\u7eaf\u4f7f\u7528ul li<\/code>\u9009\u62e9\u5668\u975e\u5e38\u5bb9\u6613\u51fa\u95ee\u9898\uff0c\u56e0\u4e3aul<\/code>\u4e0b\u9762\u6240\u6709\u7684li<\/code>\u6807\u7b7e\u90fd\u53d7\u5f71\u54cd\u4e86\uff0c\u800c\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u53ea\u60f3\u63a7\u5236\u672cul<\/code>\u4e0b\u9762\u7684li<\/code>\u5143\u7d20\u3002\u5728IE7+\u6d4f\u89c8\u5668\u4e0b\u9762\uff0c\u5c31\u6ca1\u6709\u8fd9\u6837\u7684\u62c5\u5fe7\uff0c\u4f7f\u7528ul > li<\/code>\u9009\u62e9\u5668\u5219\u5b8c\u5168\u6ca1\u6709\u8fd9\u6837\u7684\u95ee\u9898\u3002<\/p>\n

\u9664\u4e86\u6709\u6548\u964d\u4f4e\u51b2\u7a81\uff0c\u63d0\u9ad8\u9009\u62e9\u7684\u7cbe\u786e\u5ea6\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u76f8\u90bb\u7236\u5b50\u9009\u62e9\u5668\u5b9e\u73b0\u4e00\u4e9b\u5de7\u5999\u7684\u529f\u80fd\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a\u6211\u4e5f\u9875\u9762\u4e0a\u5b9e\u73b0\u85cf\u4e86\u51e0\u4e2a\u5f39\u6846\u8981\u52a0\u8f7d\u7684DOM\u5143\u7d20\uff0c\u9ed8\u8ba4\u662f\u8981\u9690\u85cf\u7684\uff0c\u7136\u540e\uff0c\u52a0\u8f7d\u5230\u5f39\u6846\u7684\u4e4b\u524d\uff0c\u9700\u8981\u662f\u663e\u793a\u7684\u3002\u600e\u4e48\u641e\uff1f<\/p>\n

\u6211\u4ee5\u524d\u7684\u505a\u6cd5\u662f\u5f39\u6846\u8981\u52a0\u8f7d\u7684\u65f6\u5019\uff0c\u4f7f\u7528JS\u8ba9DOM\u5143\u7d20\u663e\u793a\u3002\u540e\u6765\u9119\u4eba\u53d1\u73b0\uff0c\u4e0d\u9700\u8981\u52a8\u7528JS. \u7531\u4e8e\u9ed8\u8ba4\u7684DOM\u5143\u7d20\u76f4\u63a5\u653e\u5728<body><\/code>\u4e0b\uff0c\u800c\u5f39\u6846\u88c5\u8f7d\u540e\u5230\u4e86\u5f39\u6846\u91cc\u9762\uff0c\u4e8e\u662f\uff0c\u6211\u4f7f\u7528\u4e86\u4e00\u4e2a\u5c0f\u5c0f\u7684\u7236\u5b50\u9009\u62e9\u5668\u5c31\u641e\u5b9a\u4e86\u6574\u4e2a\u513f\u663e\u793a\u95ee\u9898\u3002<\/p>\n

\n
body > .dom { display: none; }<\/pre>\n<\/div>\n
\u5143\u7d20\u4e00\u65e6\u8f7d\u5165\u5f39\u6846\uff0c\u5c31\u4f1a\u81ea\u52a8\u663e\u793a\uff0c\u56e0\u4e3a\uff0c\u5b83\u5df2\u7ecf\u4e0d\u662f<body><\/code>\u4e0b\u76f8\u90bb\u7684\u5b50\u5143\u7d20\u4e86\u3002<\/p>\n
3. \u76f8\u90bb\u5144\u5f1f\u9009\u62e9\u5668<\/strong>
\n\u76f8\u90bb\u5144\u5f1f\u9009\u62e9\u5668\u6307\u7684\u662f\u7c7b\u4f3c .classA + .classB<\/code>\u8fd9\u79cd\u5199\u6cd5\u7684\u9009\u62e9\u5668\uff0c\u8868\u793a\u7d27\u8ddf\u5728\u6211\u540e\u9762\u7684\u5144\u5f1f\u9009\u62e9\u5668\uff0c\u6ce8\u610f\u5fc5\u987b\u662f\u7d27\u8ddf\u7740\u7684\u5144\u5f1f\uff0c\u5176\u4ed6\u8fdc\u4e00\u70b9\u7684\uff0c\u6216\u8005\u524d\u9762\u7684\u5144\u5f1f\u90fd\u4e0d\u884c\u3002<\/p>\n
\u522b\u5c0f\u770b\u8fd9\u4e2a\u9009\u62e9\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba9IE7\u6d4f\u89c8\u5668\u4e5f\u7efd\u653e\u593a\u76ee\u7684\u5149\u5f69\u3002<\/p>\n
\u5148\u4e3e\u4e2a\u7b80\u5355\u5b9e\u7528\u7684\u5c0f\u4f8b\u5b50\u3002\u6211\u4eec\u4f7f\u7528\u5f39\u6846\u7684\u65f6\u5019\uff0c\u53f3\u4e0b\u89d2\u6216\u5de6\u4e0b\u89d2\u6216\u8005\u4e2d\u95f4\u90fd\u6709\u4e24\u4e2a\u6309\u94ae\uff0c\u6309\u94ae\u4e4b\u95f4\u6709\u4e00\u5b9a\u7684\u8ddd\u79bb\uff0c\u5047\u8bbe20\u50cf\u7d20\uff1a<\/p>\n
\"\u5f39\u6846\u6309\u94ae\u622a\u56fe\"<\/p>\n
\u6709\u6ca1\u6709\u4ec0\u4e48\u65b9\u6cd5\u5b9e\u73b0\u5355\u7eaf\u768420\u50cf\u7d20\u95f4\u8ddd\uff0c\u800c\u6ca1\u6709\u5176\u4ed6\u591a\u4f59\u7684margin\u5462\uff1f<\/p>\n
\u4f20\u7edf\u601d\u8def\u53ef\u80fd\u662f\u8fd9\u6837\uff1a<\/p>\n
\n
.button { margin-left: 20px; }\n.button:first-child { margin-left: 0; }<\/pre>\n<\/div>\n
\u4e2d\u6587\u91ca\u4e49\u5c31\u662f\uff0c\u5de6\u8fb920\u50cf\u7d20\u95f4\u8ddd\uff0c\u5176\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u6309\u94ae\u5de6\u95f4\u8ddd\u4e3a0. \u9f13\u638c\u3002\u5176\u5b9e\u4e0d\u5931\u4e3a\u4e00\u4e2a\u597d\u65b9\u6cd5\u3002\u5982\u679c\u6211\u4eec\u8f6c\u6362\u4e0b\u601d\u8def\uff0c\u5b9e\u73b0\u8d77\u6765\u53ef\u80fd\u5c31\u66f4\u52a0\u7b80\u5355\u4e86\uff1a<\/p>\n
\n
.button + .button { margin-left: 20px; }<\/pre>\n<\/div>\n
\u5929\u7136\u7b2c\u4e00\u4e2a\u6309\u94ae\u4e0d\u4f1a\u6709margin-left<\/code>\u95f4\u8ddd\u503c\u3002<\/p>\n
\u518d\u4e3e\u4e2a\u5927\u70b9\u7684\u4e5f\u66f4\u5b9e\u7528\u7684\u4f8b\u5b50\uff0c\u5927\u5bb6\u53ef\u80fd\u542c\u8fc7CSS3\u5355\u590d\u9009\u6846\u6280\u672f<\/a>. \u5728IE9+\u6d4f\u89c8\u5668\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5355\u9009\u6846\u548c\u590d\u9009\u6846\u7684\u4e00\u4e9b\u7279\u6027\uff0c\u5b9e\u73b0\u5c55\u5f00\u6536\u8d77\uff0c\u9009\u9879\u5361\uff0c\u5f00\u5173\u6548\u679c\u7b49\u3002<\/p>\n
\u5b9e\u9645\u4e0a\uff0c\u6211\u4eecIE7\u6d4f\u89c8\u5668\u4e5f\u80fd\u8fd1\u4f3c\u5b9e\u73b0\u8fd9\u6837\u7684\u6548\u679c\u3002IE7\u3001IE8\u867d\u7136\u4e0d\u652f\u6301\u539f\u751f\u7684CSS3\u9009\u62e9\u5668:checked<\/code>, \u4f46\u662f\uff0c\u5c5e\u6027\u9009\u62e9\u5668\u8fd8\u662f\u57fa\u672c\u652f\u6301\u7684\uff0c\u52a0\u4e0a\u540c\u6837\u652f\u6301\u5404\u7c7b\u5144\u5f1f\u9009\u62e9\u5668\uff0c\u4e8e\u662f\uff0cIE7\u6d4f\u89c8\u5668\u4e5f\u80fd\u6e10\u8fdb\u4f7f\u7528\u8fd9\u7c7bCSS3\u65b0\u6280\u672f\u3002<\/p>\n
\n
:checked + .xxx { \/* IE9+\u9009\u4e2d\u6548\u679c *\/<\/span> }\n[checked] + .xxx { \/* IE8\u9009\u4e2d\u6548\u679c *\/<\/span> }\n[defaultChecked] + .xxx { \/* IE7\u9009\u4e2d\u6548\u679c *\/<\/span> }<\/pre>\n<\/div>\n
4. \u5144\u5f1f\u9009\u62e9\u5668<\/strong>
\n\u5144\u5f1f\u9009\u62e9\u5668\u6307\u7684\u662f\u7c7b\u4f3c .classA ~ .classB<\/code>\u8fd9\u79cd\u5199\u6cd5\u7684\u9009\u62e9\u5668\uff0c\u4f7f\u7528\u7684\u662f\u5f2f\u5f2f\u7b26\u53f7\uff0c\u8868\u793aA\u5143\u7d20\u540e\u9762\u7684\u6240\u6709\u5144\u5f1f\u5143\u7d20\u3002\u5bf9\uff0c\u53ea\u80fd\u662f\u540e\u9762\u7684\u5143\u7d20\u3002\u4e25\u683c\u6765\u8bf4\uff0c\u8fd9\u662f\u4e2aCSS3\u9009\u62e9\u5668\uff0c\u4f46\u662fIE7\u6d4f\u89c8\u5668\u652f\u6301\u4e4b\uff0c\u4e14\u6211\u4f7f\u7528\u4e0b\u6765\u8fd8\u6ca1\u9047\u5230\u8fc7\u4ec0\u4e48\u8be1\u5f02\u95ee\u9898\u3002<\/p>\n
IE7+\u6d4f\u89c8\u5668\u4e0b\uff0c\u7531\u4e8e\u76f8\u90bb\u5144\u5f1f\u9009\u62e9\u5668\u548c\u5144\u5f1f\u9009\u62e9\u5668\u7684\u5b58\u5728\uff0c\u6211\u4eec\u5728JS\u6784\u5efa\u4e00\u4e9bDOM\u5143\u7d20\u6765\u5b9e\u73b0\u4e00\u4e9bUI\u7ec4\u4ef6\u6548\u679c\u7684\u65f6\u5019\uff0c\u6211\u4eec\u7684\u5904\u7406\u65b9\u6cd5\u53ef\u80fd\u5c31\u4f1a\u53d1\u751f\u4e00\u4e9b\u53d8\u5316\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0cplaceholder<\/code>\u5360\u4f4d\u7b26\u6548\u679c\u3002\u4ece\u5b9e\u73b0\u4e0a\u8bb2\uff0cinput<\/code>\u5143\u7d20\u524d\u63d2\u5165\u6784\u5efa\u7684\u542bplaceholder<\/code>\u503c\u7684\u5143\u7d20\u662f\u6700\u7b80\u5355\u4e5f\u66f4\u5bb9\u6613\u5b9a\u4f4d\u7684\uff1b\u4f46\u662f\uff0c\u5b9e\u9645\u5b9e\u73b0\u7684\u65f6\u5019\uff0c\u786e\u5b9e\u8981\u9075\u5faa\u540e\u7f6e\u539f\u5219<\/strong>, \u4e5f\u5c31\u662f\u521b\u5efa\u7684\u5143\u7d20\u8981\u5728\u76ee\u6807\u5143\u7d20\u7684\u540e\u9762\u3002<\/p>\n
\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n
\u539f\u56e0\u5f88\u7b80\u5355\uff0c\u5728CSS\u4e2d\uff0c\u6211\u4eec\u6ca1\u6709\u524d\u5144\u5f1f\u9009\u62e9\u5668\uff0c\u53ea\u6709\u540e\u5144\u5f1f\u9009\u62e9\u5668\u3002\u4e8e\u662f\uff0c\u6211\u4eec\u53ea\u80fd\u6839\u636e\u524d\u9762\u5144\u5f1f\u63a7\u5236\u540e\u9762\u3002<\/p>\n
\u8fd8\u662f\u4e0a\u9762placeholder<\/code>\u4f8b\u5b50\uff0c\u7531\u4e8e\u6211\u4eec\u662f\u540e\u7f6e\u5b9e\u73b0\uff0c\u4e8e\u662f\uff0c\u6211\u4eec\u5c31\u80fd\u8f7b\u677e\u901a\u8fc7CSS\u5b9e\u73b0focus\u65f6\u5019\uff0cplaceholder<\/code>\u6587\u5b57\u900f\u660e\u5ea6\u964d\u4f4e\u523040%\u7684\u6548\u679c\uff1a<\/p>\n
\n
input:focus + .xxx { filter: alpha(opacity=40); }<\/pre>\n<\/div>\n
\u4f46\u662f\uff0c\u8981\u662f\u4f60\u524d\u7f6e\uff0c\u6216\u8005\u5305\u88f9\uff0c\u90fd\u662f\u4e0d\u884c\u6ef4\uff01<\/p>\n
5. \u5c5e\u6027\u9009\u62e9\u5668<\/strong>
\n\u5305\u62ecCSS 2.1\u6c34\u5e73\u7684\u5c5e\u6027\u9009\u62e9\u5668[attr]<\/code>, [attr=\"val\"]<\/code>, [attr~=\"val\"]<\/code>, [attr|=\"bar\"]<\/code>\u4ee5\u53caCSS3\u6c34\u5e73\u7684\u5c5e\u6027\u9009\u62e9\u5668[foo^=\"bar\"]<\/code>, [foo$=\"bar\"]<\/code>, [foo*=\"bar\"]<\/code>.<\/p>\n
\u6ca1\u9519\uff0c\u6240\u6709\u8fd9\u4e9b\u5c5e\u6027\u9009\u62e9\u5668IE7\u6d4f\u89c8\u5668\u90fd\u662f\u652f\u6301\u7684\uff0c\u867d\u7136\u67d0\u4e9b\u7ec6\u8282\u4e0a\u6709\u4e9b\u5c0fbug<\/a>, \u4f46\u662f\uff0c\u57fa\u672c\u7684\u5c5e\u6027\u5168\u90e8\u90fd\u662f\u652f\u6301\u7684\u3002<\/p>\n
\u4e8e\u662f\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528\u5c5e\u6027\u9009\u62e9\u5668\uff0c\u9690\u85cf\u9879\u76ee\u4e2d\u6240\u6709\u7684\u5355\u590d\u9009\u6846\u4ee5\u53casubmit\u6309\u94ae\uff0c\u800c\u4f7f\u7528UI\u66f4\u597d\u7684\u81ea\u5b9a\u4e49<label><\/code>\u63a7\u4ef6\u5143\u7d20\u66ff\u6362\u663e\u793a\u3002<\/p>\n
\n
input[type='radio'],\ninput[type='checkbox'],\ninput[type='submit'] {\n    position: absolute;\n    clip: rect(0 0 0 0);\n}<\/pre>\n<\/div>\n
\u597d\u4e86\uff0c\u8001\u4e00\u4ee3\u7684\u524d\u7aef\u7531\u4e8eIE6\u4e0d\u652f\u6301\u5c5e\u6027\u9009\u62e9\u5668\uff0c\u53ef\u80fd\u4e0d\u592a\u8ba4\u8bc6\uff1b\u65b0\u4e00\u4ee3\u7684\u79fb\u52a8\u7aef\u7684\u524d\u7aef\u53ef\u80fd\u53ea\u77e5\u9053CSS3\u5c5e\u6027\u9009\u62e9\u5668\uff0c\u8fd9\u91cc\u6709\u5fc5\u8981\u7b80\u5355\u79d1\u666e\u4e0b\uff0c\u5c24\u5176[attr~=\"val\"]<\/code>, [attr|=\"bar\"]<\/code>\u8fd9\u4e24\u53ae\u3002<\/p>\n
[attr~=”val”]<\/strong>
\n\u8fd9\u4e2a\u8868\u793a\uff0c\u5c5e\u6027\u503c\u4e2d\u95f4\uff0c\u6709\u5339\u914dval<\/code>\u7684\u5355\u8bcd\uff0c\u6ce8\u610f\u8fd9\u91cc\u7684\u540d\u8bcd\u2014\u2014\u201c\u5355\u8bcd\u201d\u3002CSS3\u4e2d\u6709\u4e00\u4e2a[foo*=\"bar\"]<\/code>\uff0c\u8868\u793a\uff0c\u5c5e\u6027\u503c\u4e2d\u95f4\uff0c\u6709\u5339\u914d\u7684\u5b57\u7b26\u5185\u5bb9\uff0c\u8fd9\u91cc\u8fd9\u91cc\u7684\u540d\u8bcd\u2014\u2014\u201c\u5b57\u7b26\u201d\u3002\u5927\u5bb6\u90fd\u77e5\u9053\uff0cCSS\u9009\u62e9\u5668\u8fd9\u4e1c\u897f\u662f\u8001\u5916\u5f04\u51fa\u6765\u7684\uff0c\u8001\u5916\u7684\u7684\u6bcd\u8bed\u662fEnglish, English\u7684\u53e5\u5b50\u90fd\u662f\u4e00\u4e2a\u5355\u8bcd+\u7a7a\u683c+\u4e00\u4e2a\u5355\u8bcd\u5b9e\u73b0\u7684\u3002\u8fd9\u8fd9\u91cc\u7684[attr~=\"val\"]<\/code>\u5c31\u662f\u7528\u6765\u5339\u914d\u8fd9\u4e9b\u5355\u8bcd\u7684\u3002\u56e0\u6b64\uff1a<\/p>\n
\n
\n<div attr=\"val\"><\/div>      \n<div attr=\"text val\"><\/div> \n<div attr=\"value\"><\/div>    \n<div attr=\"val-ue\"><\/div>   <\/pre>\n<\/div>\n
\u8868\u60c5\u51fa\u5356\u4e86\u4e00\u5207\u3002\u7b11\u8138\u662f\u652f\u6301\uff0c\u80fd\u8bc6\u522b\uff0c\u6293\u72c2\u662f\u4e0d\u80fd\u8bc6\u522b\u3002\u800c[attr*=\"val\"]<\/code>\u4e0a\u97624\u4e2a\u90fd\u662f\u652f\u6301\u7684\uff0c\u56e0\u4e3a\uff0c\u6bcf\u4e2aattr<\/code>\u5c5e\u6027\u503c\u90fd\u6709val<\/code>\u5b57\u7b26\u3002<\/p>\n
[attr|=”bar”]<\/strong>
\n\u8fd9\u4e2a\u8868\u793a\uff0c\u5c5e\u6027\u503c\u5f00\u5934\u5fc5\u987b\u662fbar<\/code>\u7684\u5355\u8bcd\uff0c\u6216\u8005\u5f00\u5934\u662fbar-<\/code>\u3002CSS3\u4e2d\u6709\u4e00\u4e2a[foo^=\"bar\"]<\/code>\uff0c\u8868\u793a\u5c5e\u6027\u503c\u4ee5bar<\/code>\u5b57\u7b26\u5f00\u5934\u5373\u53ef\u3002\u7c7b\u4f3c\u4e0a\u9762\u7684\u5355\u8bcd\u548c\u5b57\u7b26\u7684\u533a\u522b\uff0c\u56e0\u6b64\u6709\uff1a<\/p>\n
\n
\n<div attr=\"bar\"><\/div>      \n<div attr=\"bar-val\"><\/div> \n<div attr=\"barval\"><\/div>    \n<div attr=\"bar val\"><\/div>   <\/pre>\n<\/div>\n
\u540c\u6837\u7684\uff0c\u5982\u679c\u662f\u4f7f\u7528[foo^=\"bar\"]<\/code> CSS3\u9009\u62e9\u5668\uff0c\u5219\u4e0a\u97624\u4e2a\u90fd\u662f\u652f\u6301\u7684\uff0c\u56e0\u4e3a\uff0c\u6bcf\u4e2aattr<\/code>\u5c5e\u6027\u503c\u5f00\u5934\u90fd\u662fbar<\/code>\u5b57\u7b26\u3002<\/p>\n
\u5176\u4ed6\u5c5e\u6027\u9009\u62e9\u5668\uff0c\u901a\u4fd7\u6613\u61c2\uff0c\u6211\u5c31\u4e0d\u8be6\u7ec6\u8bf4\u660e\u4e86\u3002<\/p>\n
6. first-child\u4f2a\u7c7b\u9009\u62e9\u5668<\/strong>
\nIE7\u6d4f\u89c8\u5668\u8fd8\u652f\u6301:first-child<\/code>\u4f2a\u7c7b\uff0c\u53ef\u4ee5\u9009\u62e9\u7b2c\u4e00\u4e2a\u5b50\u5143\u7d20\u3002<\/p>\n
\u4f46\u662f\u5462\uff0c\u4e0e\u4e4b\u5bf9\u5e94\u7684:last-child<\/code>\u4f2a\u7c7b\u5374\u4e0d\u652f\u6301\uff0c\u522b\u8bf4IE7\u6d4f\u89c8\u5668\u4e86\uff0cIE8\u6d4f\u89c8\u5668\u4e5f\u4e0d\u652f\u6301:last-child<\/code>\u4f2a\u7c7b\uff0c\u4e00\u76f4\u5230IE9\u6d4f\u89c8\u5668\u624d\u652f\u6301\u3002<\/p>\n
\u8fd9\u4e2a\u4f2a\u7c7b\u80fd\u505a\u7684\u4e8b\u60c5\u53ef\u591a\u4e86\uff0c\u5404\u79cd\u5217\u8868\u554a\uff0c\u6216\u8005\u7ec6\u8282\u5e26\u56fe\u6807\u7684\u6309\u94ae\u554a\uff0c\u7b49\u7b49\uff0c\u5bf9\u5427\uff0c\u7edd\u5bf9\u53ef\u4ee5\u91ca\u653e\u66f4\u591a\u7684\u9875\u9762\u6784\u5efa\u7684\u521b\u9020\u529b\u3002<\/p>\n
\u4e09\u3001\u65b0\u652f\u6301\u7684CSS\u58f0\u660e\u6216\u7279\u6027<\/h3>\n
1. position:fixed\u56fa\u5b9a\u5b9a\u4f4d<\/strong>
\nIE6\u6d4f\u89c8\u5668\u53ea\u652f\u6301absolute\u5b9a\u4f4d\uff0cIE7\u2014\u2014\u5f00\u59cb\u652f\u6301fixed\u5b9a\u4f4d\uff0c\u4e5f\u5c31\u662f\u6d4f\u89c8\u5668\u89c2\u70b9\uff0c\u5143\u7d20\u4f4d\u7f6e\u4e0d\u53d8\uff0c\u7eb9\u4e1d\u4e0d\u52a8\uff0c\u4e0d\u88ab\u6eda\u8d70\u3002<\/p>\n
position:fixed<\/code>\u9664\u4e86\u57fa\u672c\u7684\u5b9a\u4f4d\u529f\u80fd\uff0c\u8fd8\u80fd\u5b9e\u73b0\u7eafCSS\u63a7\u5236\u7684\u5168\u5c4f\u906e\u7f69\u6548\u679c\uff0c\u4ee5\u524d\u7684JS\u52a8\u6001\u8ba1\u7b97\u5c31\u4e0d\u7528\u4e86\u7b49\u7b49\uff0c\u4e00\u4e9b\u73cd\u85cf\u79d8\u7c4d\uff0c\u4ee5\u540e\u6709\u673a\u4f1a\u518d\u5206\u4eab\u3002<\/p>\n
2. min\/max-width\/height\u6700\u5927\/\u5c0f\u5bbd\u5ea6\u9ad8\u5ea6<\/strong>
\n\u53ef\u4ee5\u5b9e\u73b0\u7279\u5b9a\u5bbd\u5ea6\u533a\u95f4\u5185\u7684\u81ea\u9002\u5e94\u5e03\u5c40\u3002\u4f8b\u5982\uff1a1024\u50cf\u7d20\u52301280\u50cf\u7d20\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528min\/max-width\/height<\/code>\u63a7\u5236\uff0c\u4e0d\u9700\u8981JS\u53c2\u4e0e\uff0c\u517c\u5bb9IE7+\u6d4f\u89c8\u5668\u3002<\/p>\n
min\/max-width\/height<\/code>\u672c\u8d28\u4e0a\u4e5f\u5c5e\u4e8e\u54cd\u5e94\u5f0fCSS\u5c5e\u6027\u3002\u5176\u4f5c\u7528\u8fd8\u662f\u5f88\u5f3a\u7684\uff0c\u4f7f\u7528\u9891\u7387\u4e5f\u662f\u76f8\u5f53\u4e4b\u9ad8\uff0c\u4ee5\u524d\u68d8\u624b\u7684\u7279\u5b9a\u8303\u56f4\u5185\u7684\u56fe\u7247\u5c3a\u5bf8\u63a7\u5236\u4e5f\u6709\u4e86\u65b0\u601d\u8def\u3002<\/p>\n
3. absolute\u62c9\u4f38<\/strong>
\nabsolute<\/code>\u5143\u7d20\uff0c\u5982\u679c\u6ca1\u6709\u660e\u663e\u7684\u5c3a\u5bf8\u9650\u5236\u8bf4\uff0c\u5f53left\/right<\/code>\u548ctop\/bottom<\/code>\u5bf9\u7acb\u65b9\u5411\u7684\u5c5e\u6027\u503c\u540c\u65f6\u5b58\u5728\u7684\u65f6\u5019\uff0c\u5143\u7d20\u7684\u5c3a\u5bf8\u4f1a\u88ab\u62c9\u4f38\uff0c\u540c\u65f6\uff0c\u8be5\u62c9\u4f38\u7684\u5143\u7d20\u5185\u90e8\u652f\u6301\u767e\u5206\u6bd4\u9ad8\u5ea6\uff0c\u4e8e\u662f\u6211\u4eec\u5c31\u80fd\u56db\u7ebf\u9ad8\u5ea6\u81ea\u9002\u5e94\u6548\u679c\u5b9e\u73b0\u3002<\/p>\n
\u5e76\u518d\u6b21\u57fa\u7840\u4e0a\u884d\u751f\u51fa\u5185\u6eda\u52a8\u5e03\u5c40\u7b49\u7b49\u3002<\/p>\n
4. png alpha\u900f\u660e<\/strong>
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5. border-color:transparent\u900f\u660e<\/strong>
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