javascript中获取指定对象的座标

javascript中获取指定对象的坐标

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document.getElementById('msgdiv').style.left=getPosLeft(a)+25;

?? document.getElementById('msgdiv').style.top=getPosTop(a)+15

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a为要取到坐标的对象

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function getPosLeft(obj)
{
??? var l = obj.offsetLeft;
??? while(obj = obj.offsetParent)
??? {
??????? l += obj.offsetLeft;
??? }
??? return l;
}

?

?

function getPosTop(obj)
{
??? var l = obj.offsetTop;
??? while(obj = obj.offsetParent)
??? {
??????? l += obj.offsetTop;
??? }
??? return l;
}