CoffeeScript中的Node.js module.exports

Question

我正在研究一个简单的例子; 我可以使用Javascript,但我的CoffeeScript版本有问题.

这是person.coffee:

module.exports = Person

class Person 
    constructor: (@name) ->

    talk: ->
        console.log "My name is #{@name}"

这是index.coffee:

Person = require "./person"
emma = new Person "Emma"
emma.talk()

我期望运行index.coffee并看到控制台输出"我的名字是艾玛".相反,我收到一个错误说TypeError:undefined in not a function.

Answer 1

把module.exports线放在底部.

---- ---- person.coffee

class Person 
    constructor: (@name) ->

    talk: ->
        console.log "My name is #{@name}"

module.exports = Person

Person = require "./person" // [Function: Person]
p = new Person "Emma" // { name: 'Emma' }

当您module.exports在顶部分配时,Person变量仍然是undefined.

Answer 2

你也可以写person.coffee:

class @Person

然后使用以下内容index.coffee:

{Person} = require './person'

Answer 3

你也可以写

module.exports = class Person
  constructor: (@name) ->
    console.log "#{@name} is a person"   

然后在index.coffee任何一个

bob = new require './person' 'Bob'

或者你可以这样做

Person = require './person'
bob = new Person 'bob'