<!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>
<style type="text/css">
#test{
position:absolute;
width:300px;
height:200px;
top:50px;
left:40px;
background-color:#3F0;
}
</style>
</head>
<body>
ddddddd
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<div id="test">测试</div>
java script
<br />
java script
<br />
java script
<br />
java script
<br />
java script
java script
java script
<br />
java script
java script
java script
java script
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
</body>
<script type="text/javascript">
var top,left;
function show(){
var tet=document.getElementById("test");
top=document.defaultView.getComputedStyle(tet,null).top;
left=document.defaultView.getComputedStyle(tet,null).left
}
function move(){
var scrolltop=document.documentElement.scrollTop;
var scrolllefe =document.documentElement.scrollLeft;
var tet=document.getElementById("test");
tet.style.top=parseInt(top)+scrolltop+"px";
}
window.onload=show
window.onscroll=move;
</script>
</html>
以上代码直接复制 、就行 。 。