code: function lazyLoad(enable, threshold) {
      if (enable != null) {
          _disableLazyLoading = !enable;
      }
      if (threshold != null) {
          _lazyLoadingThreshold = threshold;
      }
      return !_isCrawlerBotClient && !_disableLazyLoading;
  }
docs: Lazy Loading settings.
  @param {boolean} [enable] Enable or disable lazy loading.
  @param {number} [threshold] Read ahead tolerance (default is 1.0 => 100% of view size).
  @return {boolean}