利用伪对象选择器E:after实现清除浮动效果:
关于清除浮动已经是老生畅谈的问题，文章实在是太多了，几乎已经被谈烂了。
这当然是因为浮动是不居中必须要用到的技巧，那么清除浮动自然也是必须的，但是本章节还是要啰嗦一下，再次介绍一下清除浮动的方法的一种，因为它会用到之前比较少见的伪对象选择器，希望能够引起大家的注意。
先看一段代码实例:
<!DOCTYPE html><html><head><meta charset=" utf-8"><meta name="author" content="http://www.softwhy.com/" /><title>蚂蚁部落</title><head><style type="text/css">#box{ width:300px; margin:0px auto; border:5px solid red;}#box .left{ width:80px; height:50px; background:green; float:left; margin-left:10px;}#box .clear{clear:both}</style></head><body><div id="box"> <div class="left"></div> <div class="left"></div> <div class="left"></div> <div class="clear"></div></div></body></html> 上面的代码是一个普通的清除浮动的代码，虽然能够实现清除浮动的功能，但是并不够完美，因为会多出一个div标签来，这样会增加浏览器解读的压力，页面不够清爽，那么就使用伪对象选择器进行一下改造，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><head><style type="text/css">#box{ width:300px; margin:0px auto; border:5px solid red; zoom:1;}#box .left{ width:80px; height:50px; background:green; float:left; margin-left:10px;}.clearfix{*zoom:1;}.clearfix:after{ content:"."; display:block; height:0; visibility:hidden; clear:both; } </style></head><body><div id="box" class="clearfix"> <div class="left"></div> <div class="left"></div> <div class="left"></div></div></body></html> 上面的代码中，利用:after伪对象选择器，创建一个伪元素，然后给这个伪元素设置设置内容为一个点，同时设置为块级元素和clear:both这样就实现了清除浮动的效果。
相关阅读:
1.清除浮动可以参阅css清除浮动的方式汇总一章节。
2.E:after可以参阅CSS的伪对象选择符E:after/E::after一章节。
原文地址是:http://www.softwhy.com/forum.php?mod=viewthread&tid=15391
更多内容可以参阅:http://www.softwhy.com/divcss/
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