代码检查将undefined改成null

@@ -110,7 +110,7 @@ $('#limit-sale').on('touchend', function(e) {
                 }
                 }
             }, 3000);
             }, 3000);
 
 
-        }, undefined, true);
+        }, null, true);
 
 
         $('.dialog-wrapper').off('touchstart').on('touchstart', function(para) {
         $('.dialog-wrapper').off('touchstart').on('touchstart', function(para) {
             para.stopPropagation();
             para.stopPropagation();