Backbone js传递参数

Question

我是新读的Backbone js，我在Backbone js中传递 参数有一些严重的问题。

var Song = Backbone.Model.extend();
var Songs = Backbone.Collection.extend({
  model: Song
});
var SongView = Backbone.View.extend({
  el: "li",
  render: function() {
    this.$el.html(this.model.get("title"));
    return this;
  }
});
var SongsView = Backbone.View.extend({
  el: "ul",
  initialize: function() {
    this.model.on("add", this.onSongAdded, this);
  },
  onSongAdded: function(song) { // when object is added to  a collection add event is triggerd 
    // the handler for this event get an argument which is the object that was just added
    //in this case it refers to a song model so we simply pass it to our songView which is responsible for rendering a song an then we use jquery append method 
    // to append it to our list
    var songView = new SongView({
      model: Song
    });
    this.$el.append(songView.render().$el);

  },
  render: function() {
    var self = this;
    this.model.each(function(song) { //
      var songView = new SongView({
        model: Song
      });
      self.$el.append(songView.render().$el);
    });
  }
});
var songs = new Songs([
  new Song({
    title: "1"
  }),
  new Song({
    title: "2"
  }),
  new Song({
    title: "3"
  })
]);
var song_1 = new Song({
  title: "hello"
});
var songsView = new SongsView({
  el: "#songs",
  model: Songs
});
songsView.render();

你可以看到我有这个函数： onSongAdded我们有一些内置事件，比如add，得到3个这样的参数：add（collection，model，options）如何在我的代码中使用这些参数？ 你能帮助我吗？

Answer 1

el选项用于将视图指向DOM中已存在的元素。 您的项目视图应该是创建新的<li>元素，因此您应该使用tagName选项。

在您的集合视图构造函数中，您已经定义了el选项，并且在实例化时会传递不同的el选项。 如果#songs是DOM中的<uL> ，则在构造函数中定义el: "ul",没有用。

此外，无需手动实例化模型，您只需将对象传递到集合中，集合将在内部执行。 并且不要将集合作为model传递，将其作为collection传递。