Javascript 在AngularJS中每次控制器调用之前清除一个变量？

如何在每次控制器调用之前设置一些模型/变量

目前，我有以下服务可帮助我在页面上设置错误消息（代码输入）：

然后在我的

index.html

模板中：

<div ng-show="error" class="alert alert-error">{{error}}</div>
<div ng-show="success" class="alert alert-success">{{success}}</div>
<div ng-view>        

---

有没有办法自动执行此清除步骤？

如果您想在每次路由更改后清除消息（这似乎符合您的使用情况），您可以将服务更改为以下内容：

angular.module "project.services" .factory "Message", ($rootScope) ->
  # The Message factory API.
  MessageApi = {
   error :   !(msg) -> $rootScope.error = msg
   success : !(msg) -> $rootScope.success = msg
   clear :   !(msg) -> 
               $rootScope.error = ''
               $rootScope.success = ''
  }

  # Call Message.clear whenever the route changes.
  $rootScope.$on '$routeChangeSuccess', -> MessageApi.clear!

  # Return the API.
  MessageApi

---

如果您想在每次路由更改后清除消息（这似乎适合您的用例），您可以将服务更改为以下内容：

angular.module "project.services" .factory "Message", ($rootScope) ->
  # The Message factory API.
  MessageApi = {
   error :   !(msg) -> $rootScope.error = msg
   success : !(msg) -> $rootScope.success = msg
   clear :   !(msg) -> 
               $rootScope.error = ''
               $rootScope.success = ''
  }

  # Call Message.clear whenever the route changes.
  $rootScope.$on '$routeChangeSuccess', -> MessageApi.clear!

  # Return the API.
  MessageApi

angular.module "project.services" .factory "Message", ($rootScope) ->
  # The Message factory API.
  MessageApi = {
   error :   !(msg) -> $rootScope.error = msg
   success : !(msg) -> $rootScope.success = msg
   clear :   !(msg) -> 
               $rootScope.error = ''
               $rootScope.success = ''
  }

  # Call Message.clear whenever the route changes.
  $rootScope.$on '$routeChangeSuccess', -> MessageApi.clear!

  # Return the API.
  MessageApi