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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
<script language="JavaScript">
<!--
function show(obj){
var iTop = obj.offsetTop;
while(obj = obj.offsetParent){
iTop += obj.offsetTop
}
alert("距顶部"+iTop+"px")
}
//-->
</script>
</head>
<body>
<div id="oDiv" style="width:250px;height:250px;position:absolute;top:102px;left:300px;border:1px solid #DFDFDF">
</div>
<br/>
<input type="button" value="查看" onclick="show(document.getElementById('oDiv'))">
</body>
</html>