code: function nextSlide(isControl) {
          if (buildNextItem()) {
              // $B.fire('slide change ID',{
              //    slideID:curIndex
              // })
              return;
          }
          slideOutCallBack($slides[curIndex]);
          pastIndex = curIndex;
          ++curIndex > slideCount && (curIndex = slideCount);
          doSlide('next', isControl ? false : true);
          preload($slides[curIndex])($slides[curIndex + 1]);
      }
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