Coffeescript“命名空间"中的类 [英] Classes within Coffeescript 'Namespace'

问题描述

我在 Coffeescript 常见问题解答中找到了这个片段，用于创建简单的命名空间 ..

I found this snippet on the Coffeescript FAQ for creating simplistic namespaces ..

# Code:
#
namespace = (target, name, block) ->
  [target, name, block] = [(if typeof exports isnt 'undefined' then exports else window), arguments...] if arguments.length < 3
  top    = target
  target = target[item] or= {} for item in name.split '.'
  block target, top

# Usage:
#
namespace 'Hello.World', (exports) ->
  # `exports` is where you attach namespace members
  exports.hi = -> console.log 'Hi World!'

namespace 'Say.Hello', (exports, top) ->
  # `top` is a reference to the main namespace
  exports.fn = -> top.Hello.World.hi()

Say.Hello.fn()  # prints 'Hi World!'

这一切都很好，但是我在使用 class 关键字时遇到了很多麻烦.这样..

That is all well and good, but I am having a great deal of trouble doing this with the class keyword. Such that ..

namespace 'Project.Something', (exports) ->
   exports.something = -> class something
    // .. code here
   exports.somethingElse = class somethingElse extends something

任何人都可以阐明实现此目的的语法吗?

can anyone shed some light on the syntax that would accomplish this?

推荐答案

诀窍是先创建类

class MyFirstClass
  myFunc: () ->
    console.log 'works'

class MySecondClass
  constructor: (@options = {}) ->
  myFunc: () ->
    console.log 'works too'
    console.log @options

然后在文件末尾附近的某个地方导出所有需要公开的类.

Then somewhere near the end of the file export all the classes than need to be exposed.

namespace "Project.Something", (exports) ->
  exports.MyFirstClass = MyFirstClass
  exports.MySecondClass = MySecondClass

稍后你可以像这样使用这些类:

Later on you can use the classes as so:

var firstClass = new Project.Something.MyFirstClass()
firstClass.myFunc()

var secondClass = new Project.Something.MySecondClass 
  someVar: 'Hello World!'

secondClass.myFunc()

这篇关于Coffeescript“命名空间"中的类的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！