code: function() {
          if (AV._config.disableCurrentUser) {
            console.warn(
              'AV.User.currentAsync() was disabled in multi-user environment, access user from request instead https://leancloud.cn/docs/leanengine-node-sdk-upgrade-1.html'
            );
            return Promise.resolve(null);
          }
  
          if (AV.User._currentUser) {
            return Promise.resolve(AV.User._currentUser);
          }
  
          if (AV.User._currentUserMatchesDisk) {
            return Promise.resolve(AV.User._currentUser);
          }
  
          return AV.localStorage
            .getItemAsync(AV._getAVPath(AV.User._CURRENT_USER_KEY))
            .then(function(userData) {
              if (!userData) {
                return null;
              }
  
              // Load the user from local storage.
              AV.User._currentUserMatchesDisk = true;
  
              AV.User._currentUser = AV.Object._create('_User');
              AV.User._currentUser._isCurrentUser = true;
  
              var json = JSON.parse(userData);
              AV.User._currentUser.id = json._id;
              delete json._id;
              AV.User._currentUser._sessionToken = json._sessionToken;
              delete json._sessionToken;
              AV.User._currentUser._finishFetch(json);
              //AV.User._currentUser.set(json);
  
              AV.User._currentUser._synchronizeAllAuthData();
              AV.User._currentUser._refreshCache();
              AV.User._currentUser._opSetQueue = [{}];
              return AV.User._currentUser;
            });
        }
docs: Retrieves the currently logged in AVUser with a valid session,
  either from memory or localStorage, if necessary.
  @return {Promise.<AV.User>} resolved with the currently logged in AV.User.