javascript - 主干 - 当特定属性更改时触发事件的模型

Question

当特定属性发生变化时，Backbone 模型触发自定义事件的好方法是什么？

到目前为止，这是我得到的最好的:

var model = Backbone.Model.extend({
    initialize: function(){
        // Bind the mode's "change" event to a custom function on itself called "customChanged"
        this.on('change', this.customChanged);
    },
    // Custom function that fires when the "change" event fires 
    customChanged: function(){
        // Fire this custom event if the specific attribute has been changed
        if( this.hasChanged("a_specific_attribute")  ){
            this.trigger("change_the_specific_attribute");
        }
    }
})

谢谢!

Answer 1

您已经可以绑定(bind)到特定于属性的更改事件:

var model = Backbone.Model.extend({
  initialize: function () {
    this.on("change:foo", this.onFooChanged);
  },

  onFooChanged: function () {
    // "foo" property has changed.
  }
});