为什么.fetch（）未定义为Collections？

Question

我有我的模型和意见Backbone.js在单独的文件。该模型和集合是这样的

$(function(){ 

    TodoList.Models.Todo = Backbone.Model.extend({ 
     url: function(){ 
       return this.id? '/todos/' + this.id : '/todos/' ; 
       }, 
     initialize: function() { 
       } 
    }); 

    TodoList.Collections.Todos = Backbone.Collection.extend({ 
     model: TodoList.Models.Todo, 
     url: "/todos" 
}); 

}); 

视图代码是：

$(function(){ 
    Todos = TodoList.Collections.Todos; 
    TodoList.Views.AppView = Backbone.View.extend({ 
    el: $("#todo_app"), 
    events: { 
     "submit form#new_todo": "createTodo" 
    }, 
    initialize: function(){ 
     _.bindAll(this, 'addOne', 'addAll'); 
     Todos.bind("add", this.addOne); 
     Todos.bind("refresh", this.addAll); 
     Todos.bind("all", this.render); 
     Todos.fetch(); 
    }, 
     . 
     . 
     . 
}); 

的JavaScript现在不会运行。它说fetch（）函数是未定义的。有任何想法吗？

Answer 1

您应该创建托多斯收集的新实例：

Todos = new TodoList.Collections.Todos();