diff --git a/public/javascripts/wechat/directives/iphone_recognize.js b/public/javascripts/wechat/directives/iphone_recognize.js
index 27462c7f0..44fb5136a 100644
--- a/public/javascripts/wechat/directives/iphone_recognize.js
+++ b/public/javascripts/wechat/directives/iphone_recognize.js
@@ -14,7 +14,7 @@ app.directive('iphoneRecognize',["$timeout",function(timer){
                    $("#all_homework_reply,#all_blog_reply,#all_course_message_reply,#all_message_reply").css("marginBottom","0");
                        window.scrollTo(0,contentHeight)
                };
-//               if (/ipad|iphone|mac/i.test(navigator.userAgent)){
+               if (/ipad|iphone|mac/i.test(navigator.userAgent)){
                    $("#postInput1").bind('focus',function(){
                        setTimeout(function(){
                            toBottom();
@@ -30,7 +30,7 @@ app.directive('iphoneRecognize',["$timeout",function(timer){
                        $(".post-wrapper").css({"marginBottom":"10px","position":""});
                        $("#all_homework_reply,#all_blog_reply,#all_course_message_reply,#all_message_reply").css("marginBottom","52px");
                    });
-//               }
+               }
            })
         }
     }