我终于让我的Rails待办事项列表应用使用Backbone的渲染器来显示待办事项了。不过我有一个小问题。在addOne函数中，我使用了view.render（）而不是view.render（）.el，这是在教程中教过的。
这个视图不能用view.render.el（）来呈现，有什么解释吗？

$(function(){
Todos = new TodoList.Collections.Todos;
TodoList.Views.TodoView = Backbone.View.extend({
    tagName: "li",
    events: {},
    initialize: function(){},
    template: _.template('<li> <%= task %></li>'),
    render: function(){
        var todo = this.model.toJSON();
        return this.template(todo);
    }
});

TodoView = TodoList.Views.TodoView;

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

    addOne: function(todo){
        var view = new TodoView({model: todo});
        this.$("#todo_list").append(view.render());
    },

    addAll: function(){
        Todos.each(this.addOne);
    },

    newAttributes: function(event){
        var new_todo_form = $(event.currentTarget).serializeObject();
        return {
            dog: {
                name: new_todo_form["todo[task]"],
                age: new_todo_form["todo[done]"]
            }
        };
    },

    createTodo: function (e){
        e.preventDefault();
        var params = this.newAttributes(e);
        Dogs.create(params);
    }
});
});