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//
<!DOCTYPE html>
<html>
<head>
<title>this is a page</title>
<style type="text/css">
body{padding:0;
margin:0;
}
.left{width:200px;
height:500px;
position:absolute;
left:0px;
top:0px;
background: red;}
.middle{height:500px;
background: blue;
margin:0 310px 0 210px;}
.right{width:300px;
height:500px;
position:absolute;
right:0px;
top:0px;
background: orange;}
</style>
</head>
<body>
<div class="left">this is left</div>
<div class="middle">this is auto</div>
<div class="right">this is right</div>
</body>
</html>
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原文地址：http://my.oschina.net/dongdong11019/blog/498847
