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何らかの理由で、Backbone アプリでビューを複数回インスタンス化できません。私は与えられてundefined is not a functionいます。なぜでしょうか？

app.coffee

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

  initialize = ->   

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

  initialize: initialize

ビュー/start.coffee

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

ビュー/質問.コーヒー

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

初めて機能したので、構文エラーになることはありません。

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