CSS 清除浮动的写法

<span style="font-family: Arial, Helvetica, sans-serif;">一、clear</span>

<div class="clear"></div>.clear{    clear:both;}

二、chearfix:

1.

.clearfix:after{content: ".";display: block;height: 0;clear: both;visibility: hidden;font-size: 0;}.clearfix{display: block; }

2.

clearfix:after{    content:"";    display:table;    clear:both;}clearfix{*zoom:1}