boostrap判斷當前slider的index

$('#carousel-id').on('slide.bs.carousel', function (e) {
      var active = $(e.target).find('.carousel-inner > .item.active');
      var from = active.index();
      var next = $(e.relatedTarget);
      var to = next.index();

      to=to+1;

      // console.log(from + ' => ' + to);
    });

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