text: var GPBackgroundLayer = cc.Layer.extend({
      onEnter : function () {
          this._super();
          // 加载[背景]
          this.loadBackgound();
      },
      loadBackgound : function(){
          var themID = GameManager.getThemeID();
          var node = new cc.Sprite("res/GamePlay/Theme/Theme" + themID + "/BG0/BG" + themID + ".png");
          this.addChild(node);
          node.setPosition(cc.winSize.width / 2, cc.winSize.height / 2);
      }
  });