清除浮动

 

 1 .clearfix:before,
 2 .clearfix:after{
 3     content: "";
 4     display: table;
 5 }
 6 
 7 .clearfix:after{
 8     clear: both;
 9 }
10 
11 /*兼容IE8*/
12 .claearfix{
13     zoom: 1;
14 }