text: var ExtraLogic = cc.Node.extend({
      loopCount: 500,
      _sum: 0,
      ctor: function () {
          this._super();
          this.scheduleUpdate();
      },
  
      update: function (dt) {
          this._sum = 0;
          for (var i = 0; i < this.loopCount; i++) {
              ++this._sum;
          }
      },
  });
  