模式一：
<style type="text/css"> div { height:300px; border:2px solid #306;} .left{300px; position:absolute; left:0; top:0;} .right{ margin-left:310px;} body{margin:0; padding:0;} </style> </head> <body> <div class="left"></div> <div class="right"></div> </body>
模式二：
<style type="text/css"> div { height:300px; border:2px solid #306;} .left{300px; position:absolute; left:0; top:0;} .center{ margin-left:310px; margin-right:200px;} .right { 190px;position:absolute; right:0; top:0;} body{margin:0; padding:0;} </style> </head> <body> <div class="center"></div> <div class="left"></div> <div class="right"></div> </body>