JavaScript获取对象在页面中位置坐标的方法

<script language="javascript" type="text/javascript" >
function getXY(Obj) 
{
  var h = Obj.offsetHeight;
  for (var sumTop=0,sumLeft=0;Obj!=document.body;sumTop+=Obj.offsetTop,sumLeft+=Obj.offsetLeft, Obj=Obj.offsetParent);
  sumTop = h+sumTop;
  return {left:sumLeft,top:sumTop}
}
</script>