如果页面处于 Active 状态，直接载入新的回复，而不是显示提示连接;

app/assets/javascripts/app.coffee

@@ -28,6 +28,7 @@
 AppView = Backbone.View.extend
   el: "body"
   repliesPerPage: 50
+  windowInActive: true
 
   events:
     "click a.likeable": "likeable"
@@ -68,6 +69,9 @@ AppView = Backbone.View.extend
         $(el.target).parent().parent().submit()
       return false
 
+    $(window).off "blur.inactive focus.inactive"
+    $(window).on "blur.inactive focus.inactive", @updateWindowActiveState
+
   initForDesktopView : () ->
     return if typeof(app_mobile) != "undefined"
     $("a[rel=twipsy]").tooltip()
@@ -215,6 +219,18 @@ AppView = Backbone.View.extend
     img.attr('src', currentSrc.split('?')[0] + '?' + (new Date()).getTime())
     return false
 
+  updateWindowActiveState: (e) ->
+    prevType = $(this).data("prevType")
+
+    if prevType != e.type
+      switch (e.type)
+        when "blur"
+          @windowInActive = false
+        when "focus"
+          @windowInActive = true
+
+    $(this).data("prevType", e.type)
+
 window.App =
   locale: 'zh-CN'
   notifier : null

app/assets/javascripts/topics.coffee

@@ -409,7 +409,10 @@ window.TopicView = Backbone.View.extend
           if json.user_id == App.current_user_id
             return false
           if json.action == 'create'
-            $(".notify-updated").show()
+            if App.windowInActive
+              @updateReplies()
+            else
+              $(".notify-updated").show()
 
         followCurrentTopic: ->
           @perform 'follow', topic_id: Topics.topic_id