循环滑动时active出错

[ithinco]

swiper.on('swiped', function(prev, current){
      if (prev == 3 && current == 3) {
      	swiper.go(0); // active 没有正确添加到 0 上，必须手动修改
      }

      if (prev == 0 && current == 0) {
      	swiper.go(3); // 正常
      }
});