220px 和580px是怎么算出来的?
.left{width:220px;height:500px;background:#ccc;float:left}
.right{width:580px;height:500px;background:#ddd;float:right}
.left{width:220px;height:500px;background:#ccc;float:left}
.right{width:580px;height:500px;background:#ddd;float:right}
2016-09-14
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