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<td><table width="362" border="1">
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<td><table width="200" border="1" cellpadding="0" cellspacing="0" bordercolor="#0000FF" id="aa" style="border-collapse:collapse;">
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<script language="javascript">
//alert(aa.getBoundingClientRect()["right"]);
alert(aa.getBoundingClientRect().right);
for (var i in aa.getBoundingClientRect()){
document.writeln(i+"="+aa.getBoundingClientRect()[i]);
}
</script>
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本文来自：http://blog.csdn.net/sungcong/archive/2005/12/09/547848.aspx