css 清除浮动的方法

 /*方法一*/
 /*局部清除*/
 .clr:after{content:".";height:;visibility:hidden;display:block;clear:both;}
 .clr{display:inline-block;}
 .clr{display:block;}
 /*彻底清除*/
 .clear{height:;clear:both;overflow:hidden;}

 /*方法二*/
 .clearfix:before,.clearfix:after{
     content:"";
     display:table;
 }
 .clearfix:after{clear:both;}
 .clearfix{
     *zoom:;/*IE/7/6*/
 }