Swiper Slider add class before prev and after next

var mySwiper = new Swiper('.swiper-container', {
      slidesPerView: 5,
      spaceBetween: 30,
      loop: true,
      centeredSlides: true,
      pagination: {
        el: '.swiper-pagination',
        clickable: true,
      },
      on: {
        slideChange: function () {
          var activeIndex = this.activeIndex;
          var realIndex = this.slides.eq(activeIndex).attr('data-swiper-slide-index');
         $('.swiper-slide').removeClass('swiper-slide-nth-prev-2 swiper-slide-nth-next-2');
         $('.swiper-slide[data-swiper-slide-index="'+realIndex+'"]').prev().prev().addClass('swiper-slide-nth-prev-2');
         $('.swiper-slide[data-swiper-slide-index="'+realIndex+'"]').next().next().addClass('swiper-slide-nth-next-2');
        },
      }
    });

thanks man