为什么Backbone view.collection是'undefined'？

Question

var Chat = Backbone.Model.extend({
  messageList: new MessageList(),
  messageListView: new MessageListView({collection: this.messageList}),

 switchChannel: function(channel) {
     this.messageList.fetch({url: 'channels/'+channel, reset: true})
 }
});

在其他文件中：

var MessageList = Backbone.Collection.extend({
  model: Message,
})

var MessageListView = Backbone.View.extend({
  initialize: function(){
    console.log(this.collection)
    this.listenTo(this.collection, 'reset', this.render);
},

为什么我将我的收藏作为＆＃39; undefined＆＃39;？

console.log（this.collection） - ＆gt;未定义

Answer 1

我发现了这个错误：

在

var Chat = Backbone.Model.extend({
messageList: new MessageList(),
messageListView: new MessageListView({collection: this.messageList}),
...

初始化必须在'initialize'函数

var Chat = Backbone.Model.extend({
  initialize: function(){
    this.messageList = new MessageList();
    this.messageListView = new MessageListView({collection: this.messageList});
}