1 .clearfix{zoom:1;//兼容ie6,7} 2 .clearfix:after{ 3 content:"."; 4 display: "block"; 5 height: "0"; 6 clear: both; 7 visibility: hidden; 8 }
防止上下margin重叠，也可以清除浮动塌陷（推荐）
1 .clearfix:after, 2 .clearfix:before{ 3 content:" "; 4 display: table; 5 } 6 .clearfix:after{clear: both;} 7 .clear{ clear:both;}
原文：http://www.cnblogs.com/ghfjj/p/6306202.html