diff --git a/app/views/poll/_poll_form.html.erb b/app/views/poll/_poll_form.html.erb
index b081f4d18..6d1f3b6bb 100644
--- a/app/views/poll/_poll_form.html.erb
+++ b/app/views/poll/_poll_form.html.erb
@@ -7,18 +7,25 @@ function edit_head(){
     $("#polls_description").val($("#polls_description_div").html());
 }
 $(function(){
+    //点击空白处
     $(document).bind('click',function(e){
+        //弹出框非空 不是a标签 点击的不是弹出框 ，那么弹出框就会隐藏
         if(popWindow && e.target.nodeName != 'A' && !popWindow.is(e.target) && popWindow.has(e.target).length === 0){ // Mark 1
             popWindow.css('display', 'none');
         }
-        //$("#div_"+quest_type+"_"+quest_id).css('display', 'none');
     });
 })
 
+
 function chooseQuestionType(quest_type,quest_id){
+    //quest_type 分为 mc mcq single multi
+    //quest_id 是quetion的id  下同
+    if(popWindow){
+        popWindow.css('display', 'none');
+    }
     popWindow = $("#div_"+quest_type+"_"+quest_id);
     $("#div_"+quest_type+"_"+quest_id).click(function(e){
-        e.stopPropagation();
+        e.stopPropagation(); //组织冒泡到document.body中去
     });
     $("#div_"+quest_type+"_"+quest_id).css("position", "absolute");