调用咖啡脚本超级方法 [英] Calling coffescript super methods

问题描述

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()            

结果不是

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

但我收到以下错误:

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

为什么 super 是未定义的?如何调用父方法以扩展它?谢谢

How come super is undefined? How to call a parent method in order to extend it? Thanks

推荐答案

我自己找到了答案，应该是:

I found the answer myself, it should be:

class Dog extends Animal

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

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