调用coffescript超级方法(Calling coffescript super method

我有以下代码：

    class Animal
        constructor: (@name) -> 
        say: () -> console.log "Hello from animal called #{ @name }"

    class Dog extends Animal

        say: () ->
            super.say()
            console.log "Hello from dog called #{ @name }"

    a = new Animal('Bobby')
    a.say()

    d = new Dog("Duffy")
    d.say()            

其结果是不

Hello from animal called Bobby
Hello from animal called Duffy
Hello from dog called Duffy

但我得到以下错误：

Hello from animal called Bobby
Hello from animal called Duffy
Uncaught TypeError: Cannot call method 'say' of undefined

为什么超级未定义？ 如何调用父类的方法，以延长它？ 谢谢

Answer 1:

我找到自己的答案，它应该是：

class Dog extends Animal

    say: () ->
        super
        console.log "Hello from dog called #{ @name }"

文章来源: Calling coffescript super methods