body{ margin:0; padding:0; font-size:30px; font-weight:bold}
.header{height: 100px;background: #777;}
.content{height:700px;background: #000;}
.left{ width:240px; height:600px; background:#ccc; position:absolute; left:0; top:100}
.main{ height:600px; margin:0 240px; background:#9CF}
.right{ height:600px; width:240px; position:absolute; top:100; right:0; background:#FCC;}<body>
<div class="header"></div>
<div class="content">
<div class="left">left</div>
<div class="main">main</div>
<div class="right">right</div>
</div>
</body>很简单的三列布局，为什么右测一栏总会跑到下面去
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