清除浮动的疑问
<style>
.clearfix:after{
content:".";
display:block;
height:0px;
line-height:0px;
clear:both;
visibility:hidden;
font-size:0px;
}
.clearfix{*zoom:1;}
</style>
<div style="width:950px;">
<div style="width:190px; height:50px;">1</div>
<div style="width:190px; height:100px;">2</div>
<div style="width:190px; height:200px;">3</div>
<div style="width:190px; height:50px;">4</div>
<div style="width:190px; height:100px;">5</div>
<div class="clearfix"></div>
<div style="width:190px; height:100px;">6</div>
</div>