Backbone.js Can’；t第二次实例化主干视图

由于某些原因，我不能在我的主干应用程序中多次实例化视图。我得到的

未定义不是一个函数

。为什么会这样

应用程序咖啡

define [
  'views/start'
], (
  StartView
) ->

  initialize = ->   

    # Take us to the start view
    startView = new StartView()
    startView.render() # Works just fine

  initialize: initialize

define [
  'jquery'
  'underscore'
  'backbone'
  'text!templates/start.html'
  'views/question'
], (
  $
  _
  Backbone
  StartTemplate
  QuestionView
) ->

  StartView = Backbone.View.extend

    events:
      'click #btn-begin': 'pushQuestionView'

    render: ->

      # Create a template and stuff it into the view element
      @$el.html @template = _.template StartTemplate

      # Inject the HTML in the document
      $('#main').html @el

      # Return view for chaining
      @

    pushQuestionView: ->

      questionView = new QuestionView()
      questionView.render()

  StartView

define [
  'jquery'
  'underscore'
  'backbone'
  'text!templates/question.html'
  'views/form'
  'views/start'
], (
  $
  _
  Backbone
  QuestionTemplate
  FormView
  StartView
) ->

  QuestionView = Backbone.View.extend

    events:
      'click #btn-prev': 'goBack'

    render: ->

      # Create a template and stuff it into the view element
      @$el.html @template = _.template QuestionTemplate

      # Inject the HTML in the document
      $('#main').html @$el

      # Return for chaining
      @

    goBack: ->

      console.log StartView # => undefined

      startView = new StartView() # => Uncaught TypeError: undefined is not a function
      startView.render()

  QuestionView

浏览/开始。咖啡

define [
  'views/start'
], (
  StartView
) ->

  initialize = ->   

    # Take us to the start view
    startView = new StartView()
    startView.render() # Works just fine

  initialize: initialize

define [
  'jquery'
  'underscore'
  'backbone'
  'text!templates/start.html'
  'views/question'
], (
  $
  _
  Backbone
  StartTemplate
  QuestionView
) ->

  StartView = Backbone.View.extend

    events:
      'click #btn-begin': 'pushQuestionView'

    render: ->

      # Create a template and stuff it into the view element
      @$el.html @template = _.template StartTemplate

      # Inject the HTML in the document
      $('#main').html @el

      # Return view for chaining
      @

    pushQuestionView: ->

      questionView = new QuestionView()
      questionView.render()

  StartView

define [
  'jquery'
  'underscore'
  'backbone'
  'text!templates/question.html'
  'views/form'
  'views/start'
], (
  $
  _
  Backbone
  QuestionTemplate
  FormView
  StartView
) ->

  QuestionView = Backbone.View.extend

    events:
      'click #btn-prev': 'goBack'

    render: ->

      # Create a template and stuff it into the view element
      @$el.html @template = _.template QuestionTemplate

      # Inject the HTML in the document
      $('#main').html @$el

      # Return for chaining
      @

    goBack: ->

      console.log StartView # => undefined

      startView = new StartView() # => Uncaught TypeError: undefined is not a function
      startView.render()

  QuestionView

观点/问题。咖啡

define [
  'views/start'
], (
  StartView
) ->

  initialize = ->   

    # Take us to the start view
    startView = new StartView()
    startView.render() # Works just fine

  initialize: initialize

define [
  'jquery'
  'underscore'
  'backbone'
  'text!templates/start.html'
  'views/question'
], (
  $
  _
  Backbone
  StartTemplate
  QuestionView
) ->

  StartView = Backbone.View.extend

    events:
      'click #btn-begin': 'pushQuestionView'

    render: ->

      # Create a template and stuff it into the view element
      @$el.html @template = _.template StartTemplate

      # Inject the HTML in the document
      $('#main').html @el

      # Return view for chaining
      @

    pushQuestionView: ->

      questionView = new QuestionView()
      questionView.render()

  StartView

define [
  'jquery'
  'underscore'
  'backbone'
  'text!templates/question.html'
  'views/form'
  'views/start'
], (
  $
  _
  Backbone
  QuestionTemplate
  FormView
  StartView
) ->

  QuestionView = Backbone.View.extend

    events:
      'click #btn-prev': 'goBack'

    render: ->

      # Create a template and stuff it into the view element
      @$el.html @template = _.template QuestionTemplate

      # Inject the HTML in the document
      $('#main').html @$el

      # Return for chaining
      @

    goBack: ->

      console.log StartView # => undefined

      startView = new StartView() # => Uncaught TypeError: undefined is not a function
      startView.render()

  QuestionView

---

因为它是第一次工作，所以不可能是语法错误。

您指的是

start

中的

question

和

question

中的

start

。它形成循环依赖。这就是这个问题的原因

来自文件

如果定义了循环依赖项（a需要b，b需要a），则在 在这种情况下，当调用b的module函数时，它将得到一个未定义的 a的价值

---

这似乎不对；相对于

main.coffee

的文件路径是

views/start

。我现在试着把它改成你的建议，结果requirejs抛出了一个404.oh。很抱歉我想这应该是一条上升的路。你能试试吗？。/start是的。我错了。它应该是

views/start

。你说得对。但你还有其他问题，这确实是问题所在。我用

StartView=require（'views/start'）

修复了它。谢谢在获得

未捕获类型错误：

之前，您在控制台中是否遇到任何错误？可能是您在

开始中引用了
问题
，在
问题
中引用了
开始
。这可能就是问题的原因。没有其他错误。我指的确实是《开始》中的问题，以及《开始》中的问题。这通常是个问题吗？是的。这就是问题所在。请参阅我的最新答案。