你可以擴展初始化模型嗎？

Question

class TheModel extends Backbone.Model 
    foo: 
     #bar 

Entity = new TheModel(#pass in attributes)

我可以再擴展實體和維護模型屬性/狀態？

class User extends Entity 
    foo: 
     super 
     #more 

編輯：

class Entity extends Backbone.Model 
    initialize: (options) -> 
     @_events options 

     _events: (options) -> 
      entity.bind 'foo' 

class Entity1 extends Entity 
    _events: (options) -> 
     super options 
     entity.bind 'bar' 

class Entity2 extends Entity 
    _events: (options) -> 
     super options 
     entity.bind 'baz' 

#a new entity arrives, we don't know if he is type one or two yet so he is... 
entity = new Entity 

#now we find out he is type 2 
entity = new Entity2(entity.attributes) 

Answer 1

號有一個類延伸的對象（而不是函數）沒有意義。如果你試圖實例化User類，你會得到錯誤

TypeError: Cannot read property 'constructor' of undefined 

如果你想覆蓋foo方法上Entity，你應該這樣做直接，但請注意，super語法將無法正常工作。相反，你應該寫

entity.foo = -> 
    @constructor::foo.apply arguments # equivalent to super 
    # ...