Swiper踩坑，重复加载

function mainSwiperByIndex() {
    var mySwiper = new Swiper('.main-sect .swiper-container', {
        pagination: {
            el: '.swiper-pagination .swiper-container',
            clickable: true,
        },
        slidesPerView: 2.4,
        spaceBetween: 30,
        paginationClickable: true,
        longSwipesRatio: 0.3,
        touchRatio: 1,
        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
        loop: false //这属,很有用啊
    })
}