coffeescript - CoffeeScript 中的静态类和方法

Question

我想在coffeescript中编写一个静态帮助器类。这可能吗？

类别:

class Box2DUtility

  constructor: () ->

  drawWorld: (world, context) ->

使用:

Box2DUtility.drawWorld(w,c);

Answer 1

您可以通过在类方法前添加 @ 前缀来定义类方法:

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

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

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

如果您希望 drawWorld 充当构造函数，那么您可以这样说 new @:

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/