Question

我有一些问题需要理解服务处理承诺中的行为。在下面的代码中，我有一个异步调用服务器。尝试在.then调用中使用@ $ rootScope是不可能的。但是将@ $ rootScope分配给类_rs中的属性就可以了。我不明白为什么？

namespace( 'com.myapp.service'

  SessionService:

    class SessionService

      _rs = null
      _this = null

      # Specify expected constructor services
      @$inject  : ["$rootScope", "$log", "User" ]

      constructor : (@$rootScope, $log, @User) ->
        # Scope binding and this interpolation
        _rs = @$rootScope
        _this = @

        $log.debug("Calling constructor of SessionService")
        @currentUser = ""

        @initCurrentUser()

        return this

      loadCurrentUser : () ->
        return serverFunctions().func('sessionService').loadCurrentUser("async")

      initCurrentUser : () ->
        result = @loadCurrentUser()

        result.then (res) ->
          _rs.$apply ->
            _this.currentUser = "test"

        result.fail (e) ->
          _rs.$apply ->
            console.error(e)

      # Returns current user
      getCurrentUser: () ->
        return _this.currentUser
)

此外，当我在getCurrentUser方法中使用@currentUser而不是_this.currentUser时，它无法正常工作。控制器中的UI不会更新。

感谢您的帮助！

Answer 1

namespace( 'com.myapp.service'

  SessionService:

    class SessionService

      # Specify expected constructor services
      @$inject  : ["$rootScope", "$log", "User" ]

      constructor : (@$rootScope, $log, @User) ->

        $log.debug("Calling constructor of SessionService")
        @currentUser = ""

        @initCurrentUser()

        return this

      loadCurrentUser : () ->
        return serverFunctions().func('sessionService').loadCurrentUser("async")

      initCurrentUser : () =>
        result = @loadCurrentUser()

        result.then (res) =>
          @$rootScope.$apply =>
            @currentUser = "test"

        result.fail (e) =>
          @$rootScope.$apply =>
            console.error(e)

      # Returns current user
      getCurrentUser: () =>
        return @currentUser
)

AngularJS承诺使用CoffeeScript类进行处理

1 个答案: