JS implements the method of setting the absolute positions of ff and ie elements

This article shows how the JS implementation sets the absolute positions of ff and ie elements. To share with you for your reference, as follows:

function Show_menu(liid,divid)
{
  var li=document.getElementById(liid);
  var div=document.getElementById(divid);
  div.style.left=getLeft(li)+140+'px';
  div.style.top= getTop(li)+'px';
  var tt=div.style.top;
  div.style.display='block';
  alert(tt);
}
function getTop(e){ // I'm going to evaluate it recursively 
  var offset=e.offsetTop;
  if(e.offsetParent!=null) offset+=getTop(e.offsetParent);
  return offset;
}
function getLeft(e){
  var offset=e.offsetLeft;
  if(e.offsetParent!=null) offset+=getLeft(e.offsetParent);
  return offset;
}

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I hope this article is helpful to JavaScript program design.