開發專案的時候自動更新功能呢，需要獲取app的版本，cordova-plugin-app-version可以用來的獲取版本號，可以用命令列：cordova plugin add cordova-plugin-app-version，或者在配置檔案config.xml、package.json進行配置。

cordova.getAppVersion.getVersionNumber()就可以獲取當前的版本

  getServerVersion: function (curVersion) {
    var deferred = $q.defer(),
      promise;

    if
 
 (curVersion) {
      promise = $http.get(CONFIG.url.version, {params: {version: curVersion}});
    } else {
      promise = $http.get(CONFIG.url.version);
    }
    promise.then(function (response) {
      deferred.resolve(response.data.data.versions);
    }).catch(function (error) {
      deferred.reject(error);
    });
    return
 
 deferred.promise;
  },

  getLocalVersion: function () {
    var deferred = $q.defer();

    **cordova.getAppVersion.getVersionNumber()**.then(function (localVersion) {
      deferred.resolve(localVersion);
    }).catch(function (error) {
      deferred.reject(error);
    });
    return deferred.promise;
  },

  checkUpdate: function
 
 () {
    var self = this,
      localVersion;

    this.getLocalVersion().then(function (response) {
      localVersion = response;
      return self.getServerVersion(response);
    }).then(function (serverVersions) {
      var latestVersion = _.isArray(serverVersions) ? _.first(serverVersions) : serverVersions,
        laterThanServer = commonService.laterThan(localVersion, latestVersion.number),
        isForceUpdate = _.some(_.initial(serverVersions), function (item) {
          return item.flag === 1;
        });

      commonService.setItem("latestVersion", latestVersion);
      return laterThanServer && isForceUpdate;
    }).then(function (isForce) {
      isForce && commonService.confirm(i18n.need_update_label, i18n.force_update_tip).then(function (res) {
        if (res) {
          checkUpdateEnv(isForce);
        } else {
          ionic.Platform.exitApp();
        }
      });
    }).catch(function (reason) {
      console.log("version compare filed : " + JSON.stringify(reason));
    });
  }

但是有一點需要注意的是執行此語句，必須等待DOM元素載入完畢。簡單一點就是，若是在傳統的javaScript中用到，需要配合著window.onload使用，或者 ionic.Platform.ready中

   ionic.Platform.ready(function () {
      if (window.cordova && window.cordova.plugins && window.cordova.plugins.Keyboard) {
        window.cordova.plugins.Keyboard.hideKeyboardAccessoryBar(false);
        window.cordova.plugins.Keyboard.disableScroll(true);
        apiService.checkUpdate();
      }
      try {
        $cordovaStatusbar.style(0);
        checkNetworkState();
        checkSystemVersion();
        $ionicPlatform.is("Android") && $ionicPlatform.registerBackButtonAction(registerBackButton, 101);
      } catch (e) {
        console.warn("some thing error when app launched: " + e.message);
      }
      autoLogin();
    });