css的!important用法介绍:
!important可以提升css语句的权重，下面就通过代码实例做一下简单介绍。
它有些浏览器兼容性问题，出在奇葩的IE6浏览器身上，不过问题不大，因为IE6的用户以后会越来越少直到绝迹。
代码如下:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><style type="text/css">#antzone{ width:150px; height:100px; background-color:green!important;}#antzone{ background-color:blue;}</style> </head> <body> <div id="antzone"></div></body> </html> 上面的代码中，如果不使用!important话，那么背景颜色就是蓝色，因为后面的语句会覆盖前面的，但是如果使用!important就会提升响应语句的权重了，关于IE6的兼容性问题，可以参阅CSS的!important语法规则一章节。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=15084
更多内容可以参阅:http://www.softwhy.com/divcss/
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