Coffeescript类命名空间方法

Question

 class SocialStudies
      constructor : (@val1,@val2) ->
          console.log 'constructed '+@val1+' | '+@val2
      doAlerts :
          firstAlert : =>
               alert @val1
          secondAlert : =>
               alert @val2

 secondPeriod = new SocialStudies 'git to class!', 'no recess for you!'

 secondPeriod.doAlerts.firstAlert() // error this.val1 is not defined

Hopefully you get the idea. I would like to access @val1 from a method set inside a method, and fat arrow does nothing! Does anyone know what to do here?

Answer 1

 class SocialStudies
      constructor : (@val1,@val2) ->
          console.log 'constructed '+@val1+' | '+@val2
          @doAlerts =
            firstAlert : =>
                alert @val1
            secondAlert : =>
                alert @val2

Answer 2

You can, of course, do it also like this:

class SocialStudies
  constructor: (@val1, @val2) ->
    @doAlerts = firstAlert: @firstAlert, secondAlert: @secondAlert
  firstAlert: =>
    alert @val1
  secondAlert: =>
    alert @val2

This it otherwise equivalent to Keith Nicholas' answer, but allows using the super keyword in the methods in inherited classes, so you could do, say, like this:

class AntiSocialStudies extends SocialStudies
  secondAlert: =>
    @val2 += ' no solitary drinking until 3PM.'
    super

secondPeriod = new AntiSocialStudies 'git to class!', 'no recess for you!'
secondPeriod.doAlerts.secondAlert()