参数'fn'不是函数获取字符串

Question

我在我的角应用程序中有一个部分,我已经绑定了一个控制器,
从那时起我得到了参数'fn'不是函数错误,任何人都可以看看我的代码并解释为什么我得到了这个错误？

我会非常感激:)

HTML的标记:

<section class="col-lg-12" data-ng-controller="MessageController">
  <fieldset>
    <legend>{{ 'MESSAGES' | translate }}</legend>
  </fieldset>
  <div class="margin-left-15">
    <ul class="list-style-button">
      <li data-ng-repeat="message in MSG">{{ message }}</li>
    </ul>
  </div>
</section>

控制器:

(function() {
  'use strict';

  var controllers = angular.module('portal.controllers');

  controllers.controller('MessageController', ['$scope', 'MessageService', '$rootScope', function MessageController($scope, MessageService, $rootScope) {
    $rootScope.MSG = MessageService.getMessages();

    $rootScope.$watch('MSG', function(newValue) {
      $scope.MSG = newValue;
    });
  }]);
}());

服务:

(function() {

  'use strict';

  var messageServices = angular.module('portal.services');

  messageServices.factory('MessageService', ['MessageData', 'localStorageService', 'UserService'], function(MessageData, localStorageService, UserService) {
    return new MessageService(MessageData, localStorageService, UserService);
  });

  function MessageService(MessageData, localStorageService, UserService) {
    this.messageData = MessageData;
    this.localStorageService = localStorageService;
    this.userService = UserService;
  }

  MessageService.prototype.getMessages = function() {
    var locale = this.userService.getUserinfoLocale();
    var messages = this.localStorageService.get(Constants.key_messages + locale);
    if (messages !== null && messages !== undefined) {
      return JSON.parse(messages);
    } else {
      return this.messageData.query({
        locale: locale
      }, $.proxy(function(data, locale) {
        this.save(Constants.key_messages + locale, JSON.stringify(data));
      }, this));
    }
  };

  MessageService.prototype.save = function(key, value) {
    this.localStorageService.add(key, value);
  };

}());

数据:

(function() {
  'use strict';

  var data = angular.module('portal.data');

  data.factory('MessageData', function($resource) {
    return $resource(Constants.url_messages, {}, {
      query: {
        method: 'GET',
        params: {
          locale: 'locale'
        },
        isArray: true
      }
    });
  });
}());

html头中js文件的顺序:

<script src="js/lib/jquery-1.10.js"></script>
<script src="js/lib/angular.js"></script>
<script src="js/lib/angular-resource.js"></script>
<script src="js/lib/angular-translate.js"></script>
<script src="js/lib/angular-localstorage.js"></script>
<script src="js/lib/jquery-cookies.js"></script>
<script src="js/lib/bootstrap.js"></script>
<script src="js/portal.js"></script>

Answer 1

问题在于使用'错误'语法来创建服务
而不是使用:

messageServices.factory('MessageService', 
    ['MessageData','localStorageService', 'UserService'], 
    function(MessageData, localStorageService, UserService){
        return new MessageService(MessageData, localStorageService, UserService);
    }
);

我不得不使用:

messageServices.factory('MessageService', 
    ['MessageData','localStorageService', 'UserService', 
    function(MessageData, localStorageService, UserService){
        return new MessageService(MessageData, localStorageService, UserService);
    }
]);

我很快就用参数关闭了数组,因为我还在学习,我没有直接看到它,无论如何我希望我可以帮助那些偶然发现它的人.

Answer 2

今天我犯了同样的错误,做了那个愚蠢的错误:

(function(){

  angular
    .module('mymodule')
    .factory('myFactory', 'myFactory');   // <-- silly mistake 

  myFactory.$inject = ['myDeps'];
  function myFactory(myDeps){
    ...
  }

}());

而不是:

(function(){

  angular
    .module('mymodule')
    .factory('myFactory', myFactory);   // <-- right way to write it    

  myFactory.$inject = ['myDeps'];
  function myFactory(myDeps){
    ...
  }

}());

事实上,字符串"myFactory"被带入正在等待函数而不是字符串的注入器中.这解释了[ng:areq]错误.