<!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" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
*{
margin: 0px;
padding:0px;
}
#div1{
width: 500px;
height: 500px;
position: relative;
border:1px solid #ff00ff;
top:100px;
left: 300px;
}
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position: absolute;
width: 150px;
height: 150px;
top:0px;
left:0px;
background: #ff00ff;
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.boxs{
border:1px dashed #000000;
position: absolute;
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function unEvent(obj,even,fn){
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odiv2=document.getElementById("div2");
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creatElement.style.height=odiv2.offsetHeight-2+"px";
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</script>
</head>
<body>
<div id="div1">
<div id="div2"></div>
</div>
</body>
</html>
