浮动

/*== 清除浮动 ==*/
/*=1=*/
.clearfix:after { content:"."; display:block; height:0; font-size:0; clear:both; visibility:hidden;}

----对应的 新建div

.clearfix {/* overflow:auto;*/ zoom:1;}-----------

检查是否清除浮动

/*=2=*/

div.divclear { clear:both; font-size:0; line-height:0;}
/*== 清除浮动 ==*/