docs: function Node (options) {
      options = options || {}
      this._contentSize = options.contentSize || new geo.Size(0, 0)
      this._anchorPoint = options.anchorPoint || ccp(0.0, 0.0)
      this._updateAnchorPointInPixels() // Sets this.anchorPointInPixels
      this._position = options.position || ccp(0, 0)
      this.children = []
  
      events.addListener(this, 'dirtytransform', this._dirtyTransform.bind(this))
  }