点主DIV删除其中的所有子DIV

<script type="text/javascript">
function removeChildDiv(obj){
   obj.style.display="none";
  var divs = obj.getElementsByTagName("div");
  for(var n=0; n<divs.length; n++){
    divs[n].removeNode(true)
  }
}
</script>
<div style='height:500;background:red' onclick="removeChildDiv(this)">
<div style="background:blue;height:200">删除它sdf</div>删除它
</div>
sdfasd