<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Triple column layout</title>
<style type="text/css">
body{margin: 0;padding: 0;width:900px;}
#left{float:left;width: 33.33%；height:300px;background: red;}
#middle{float:left;width: 33.33%；height:300px;background: blue;}
#right{float:right;width: 33.33%；height:300px;background: green;}
</style>
</head>
<body>
<div id="left">left</div>
<div id="middle">middle</div>
<div id="right">right</div>
</body>
</html>代码如上，实现效果图如下：
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