css之clearfix清除浮动

.clearfix {
*zoom: 1;
}
.clearfix:before,  .clearfix:after {
display: table;
line-height: 0;
content: "";
}
.clearfix:after {
clear: both;
}

.clearfix:after{
content:".";
display:block;
height:0;
clear:both;
visibility:hidden;
}
.clearfix{
_zoom:1; //这是针对于IE6的
}