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javascript getBoundingClientRect() 来获取页面元素的位置的代码[修正版]

<!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>Demo</title> 
</head> 
<body style="width:2000px; height:1000px;"> 
<div id="demo" style="position:absolute; left:518px; right:100px; width:500px; height:500px; background:#CC0000; top: 114px;">Demo为了方便就直接用绝对定位的元素</div> 
<script type="text/javascript"> 
document.getElementById(demo).onclick = function() { 
if (document.documentElement.getBoundingClientRect) { 
alert("left:" + this.getBoundingClientRect().left); 
alert("top:" + this.getBoundingClientRect().top); 
alert("right:" + this.getBoundingClientRect().right); 
alert("bottom:" + this.getBoundingClientRect().bottom); 
var X = this.getBoundingClientRect().left + document.documentElement.scrollLeft; 
var Y = this.getBoundingClientRect().top + document.documentElement.scrollTop; 
alert("Demo的位置是X:" + X + ";Y:" + Y); 
} 
} 
</script> 
</body> 
</html>

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