js定三个div的高度一样
<!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=utf-8" />
<title>无标题文档</title>
</head>
<script type="text/javascript" src="js/jquery-1.7.1.min.js"></script>
<script type="text/javascript">
$(function(){
var a=Math.max(document.getElementById("aa").offsetHeight,document.getElementById("bb").offsetHeight,document.getElementById("cc").offsetHeight);
document.getElementById("aa").style.height = a + "px";
document.getElementById("bb").style.height = a + "px";
document.getElementById("cc").style.height = a + "px";
})
</script>
<style>
#aa,#bb,#cc{ border:#999 solid 1px; width:100px; float:left; margin-left:20px;}
</style>
<body>
<div id="aa">111111<br />111111<br />111111<br />111111<br />111111<br />111111<br />111111<br />111111<br />111111<br />111111<br />111111<br />111111<br /></div>
<div id="bb">888</div>
<div id="cc">999</div>
</body>
</html>
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