coffeescript 中的静态类和方法 [英] Static classes and methods in coffeescript

问题描述

我想在coffeescript 中编写一个静态助手类.这可能吗?

I want to write a static helper class in coffeescript. Is this possible?

类:

class Box2DUtility

  constructor: () ->

  drawWorld: (world, context) ->

使用:

Box2DUtility.drawWorld(w,c);

推荐答案

您可以通过在类方法前加上 @ 来定义它们:

You can define class methods by prefixing them with @:

class Box2DUtility
  constructor: () ->
  @drawWorld: (world, context) -> alert 'World drawn!'

# And then draw your world...
Box2DUtility.drawWorld()

演示:http://jsfiddle.net/ambiguous/5yPh7/

如果你想让你的 drawWorld 像构造函数一样工作，那么你可以这样说 new @:

And if you want your drawWorld to act like a constructor then you can say new @ like this:

class Box2DUtility
  constructor: (s) -> @s = s
  m: () -> alert "instance method called: #{@s}"
  @drawWorld: (s) -> new @ s

Box2DUtility.drawWorld('pancakes').m()

演示:http://jsfiddle.net/ambiguous/bjPds/1/

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