var mySwiper = new Swiper ('.swiper-container', {
      direction: 'vertical',     loop: true,     // 如果需要前进后退按钮     nextButton: '.swiper-button-next',     prevButton: '.swiper-button-prev',     effect : 'coverflow',     //slidesPerView: 3,     centeredSlides: true,     stretch:500,     coverflow: {
          rotate: 30,         stretch: 10,         depth: 60,         modifier: 4,         slideShadows : false     } })