$require(['swiper'], function () {
    var swiper = new Swiper('.magnify', {
        observer:true,  //修改swiper自己或子元素时，自动初始化swiper
        observeParents:true,  //修改swiper的父元素时，自动初始化swiper
        slidesPerView: 3,
        spaceBetween: 20,
        centeredSlides: true,
        loop: true,
        navigation: {
            nextEl: '.Under',
            prevEl: '.Upper',
        },
      
         breakpoints: { 
      320: {  //当屏幕宽度大于等于320
        slidesPerView: 1,
      },
      768: {  //当屏幕宽度大于等于768 
        slidesPerView: 3,
      },
      1280: {  //当屏幕宽度大于等于1280
        slidesPerView: 3,
      }
    }
      
    });
})