默认显示三张，第一张和第三张只显示一半，中间全部显示，点击可左右切换默认显示一二张

项目地址：

https://github.com/holiday0912/SwiperPreView

  var swiper = new Swiper(".swiper-container", {
    autoplay: false,
    loop: true,
    initialSlide: 2,
    spaceBetween: 20,
    centeredSlides: true,
    slidesPerView: 1.9,
    pagination: {
      el: ".swiper-pagination",
      clickable: true,
    },
    // 如果需要前进后退按钮
    // navigation: {
    //   nextEl: ".swiper-button-next",
    //   prevEl: ".swiper-button-prev",
    // },
  });