jquery.pseudo.js让IE6、7也能用伪类:before
直接上代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><script type="text/javascript" src="javascript/jquery-1.5.1.min.js"></script><script type="text/javascript" src="javascript/jquery.pseudo.js"></script><title>jquery.pseudo.js模拟CSS伪类:before(解决IE6、7 :before无效)</title><style>html{overflow:auto}body{font:12px Arial, Helvetica, sans-serif;background:#FFF}body,h1,h2,h3,h4,h5,h6,p,ul{margin:0}ul{padding:0}li{ list-style:none}.d_a{width:400px;margin:20px auto 0;border:1px solid #BECEEB;padding:3px;background:#CAD5EB;_overflow:hidden}.u_a{border:1px solid #BECEEB;background:#FFF;padding-bottom:20px;}.u_a li.u_a_l{margin-bottom:15px;padding:0 5px;}.u_a_h{font-size:14px;padding:0 10px; border-bottom:1px dashed #BECEEB;line-height:25px;color:#333}.u_a_a{margin:5px 0 0 5px;}.u_a_a li{overflow:hidden;white-space:nowrap;text-overflow:ellipsis;line-height:21px;_width:95%;}.u_a_a li:before,.u_a_a li{before: '? ';content: '? ';line-height:20.3px\9;*line-height:21px}.u_a_a li a{color:#34538B; text-decoration:none}.u_a_a li a:hover{color:#34538B; text-decoration: underline}</style></head><body><div width="418" alt="jquery.pseudo.js让IE6、七也能用伪类:before" height="386" src="/img/2012/10/16/1705428389.png">?
line-height:20.3px\9
看到这行代码没，这让我很吃惊，px用小数居然也有效！而且，20.3px、20.4px、20.2px效果都不一样（IE8都已测过），具体原因不明。。。
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