问backbone集合获取不会触发reset()

EN

var mssg = mssg || {};

mssg.MessagesView = Backbone.View.extend({

el: '#messages',

initialize: function() {
    this.collection.fetch();
    this.collection.bind('reset', this.render, this);
},

render : function() {
    this.$el.html('');
    this.collection.each(function( item ) {
        this.renderMessage( item );
    }, this );
    return this;
},

renderMessage : function( item ) {
    var messageView = new mssg.MessageView({
        model : item
    });
    this.$el.append( messageView.render().el );
}

});

var mssg = mssg || {};

mssg.Messages = Backbone.Collection.extend({
    model : mssg.Message,
    url : 'messages'
});

var mssg = mssg || {};

$(function() {
    new mssg.MessagesView({
        collection : new mssg.Messages()
    });
});