code: function ActionEase (opts) {
      if (!opts.action) {
          throw "Ease: action argument must be non-nil"
      }
      ActionEase.superclass.constructor.call(this, {duration: opts.action.duration})
  
      this.other = opts.action
  }
docs: @class
  Base class for Easing actions
  
  @memberOf cocos.actions
  @extends cocos.actions.ActionInterval
  
  @opt {cocos.actions.ActionInterval} action