code: function ScaleTo (opts) {
      ScaleTo.superclass.constructor.call(this, opts)
  
      if (opts.scale !== undefined) {
          this.endScaleX = this.endScaleY = opts.scale
      } else {
          this.endScaleX = opts.scaleX
          this.endScaleY = opts.scaleY
      }
  }
docs: @class
  Scales a cocos.Node object to a zoom factor by modifying it's scale attribute.
  
  @memberOf cocos.actions
  @extends cocos.actions.ActionInterval
  
  @opt {Float} duration Number of seconds to run action for
  @opt {Float} [scale] Size to scale Node to
  @opt {Float} [scaleX] Size to scale width of Node to
  @opt {Float} [scaleY] Size to scale height of Node to