diff --git a/public/javascripts/wechat/controllers/activity.js b/public/javascripts/wechat/controllers/activity.js
index 1ad4b9c1e..8847e8e10 100644
--- a/public/javascripts/wechat/controllers/activity.js
+++ b/public/javascripts/wechat/controllers/activity.js
@@ -136,7 +136,7 @@ app.controller('ActivityController',
 
     //跳到详情页
     $scope.goDetail = function(type, act_id,id){
-        rms.save("yoffset", window.document.body.scrollTop);
+        rms.save("yoffset", document.documentElement.scrollTop);
         rms.save("activities",$scope.activities);
         rms.save("course_activities",$scope.course_activities);
         rms.save("project_activities",$scope.project_activities);