方法一、
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>织梦模板下载</title>
<style type="text/css">
body{margin:0px;padding:0px;color:black;text-align:center;font-family:Arial, Helvetica, sans-serif;font-size:12px;line-height: 140%;}
div{margin:0px;padding:0px;border:0px;}
#main{width:780px;margin:0 auto;overflow:hidden;background:#CCC;}
#left{width:400px;float:left;background:#FF9966;border:1px solid #f00;}
#right{width:350px;float:right;background:#6699CC;border:1px solid #f00;}
</style>
</head>
<body>
<div id="main">
<div id="left">left<br />用力撑开左边DIV<br />用力撑开左边DIV<br />用力撑开左边DIV<br />用力撑开左边DIV<br />用力撑开左边DIV<br /></div>
<div id="right">right<br />右边DIV的高度也被撑高了吧~</div>
</div>
<script type="text/javascript">
document.getElementById("right").style.height=document.getElementById("main").scrollHeight+"px";
document.getElementById("left").style.height=document.getElementById("main").scrollHeight-2+"px";
</script>
</p>
</body>
</html>
方法二、
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style>
#wrap{ margin:100px auto 0 auto; overflow:inherit;border:1px solid #999;}
.col1,.col2 { margin:0 10px; width:100px; background:#f1f1f1; height:auto;float:left;}
.clear { clear:both;}
</style>
<script language="JavaScript">
<!--
function alertHeight(){
var divH1 = document.getElementById("col1");
var divH2 = document.getElementById("col2");
var allHeight= divH1.clientHeight > divH2.clientHeight ? divH1.clientHeight:divH2.clientHeight;
divH1.style.height=allHeight + 'px';
divH2.style.height=allHeight + 'px';
}
window.onload=alertHeight;
//-->
</script>
</head>
<body>
<div id="wrap">
<div id="col1" class="col1">1<br />2<br />3<br />1<br />2<br />3<br />1<br />2<br />2<br />3<br /></div>
<div id="col2" class="col2">1<br />2<br />3<br />4<br />5<br /><br />4<br />5<br /><br />4<br />5<br /><br /><br />4<br />5<br /></div>
<div class="clear"></div>
</div>
</body>
</html>
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