div 层外点击鼠标隐藏该层

document.onclick=check;
function check(e){
   var target = (e && e.target) || (event && event.srcElement);
   var obj = document.getElementById('popTree_Div');
   var buttonObj = document.getElementById("query_zt");
   var textObj = document.getElementById("record:dczd_mc");
   if(target==buttonObj){obj.style.display='';}
   else if(target==textObj){obj.style.display='';}
   else if(target!=obj){obj.style.display='none';}
}