缓存动态页tab，详情返回到对应tab页

public/javascripts/wechat/controllers/activity.js

@@ -122,12 +122,14 @@ app.controller('ActivityController',
                 }
                 break;
         }
+        rms.save("tab_num",$scope.currentTab);
     }
 
-    $scope.currentTab = 1;
+
+    $scope.currentTab = rms.get('tab_num') || 1;
 
     if($scope.activities.length<=0){
-        $scope.loadActData(1,0);
+        $scope.loadActData('tab_num',0);
     } else {
         $timeout(function(){
             window.scrollTo(0, rms.get("yoffset"));