js抓取指定的子節點

function getChildOfDIV(objId){
  var labels = objId.childNodes;
	var rlabel;
  for(var i = 0; i < labels.length; i++){
   var label = labels[i];
   if ("DIV" == label.nodeName){
    label.value = i;
		rlabel = label;
		break;
   }
  }
	return rlabel;
}