//预览图
$('.banxue-item .gallery-thumbs').each(function(i,ele){
window['galleryThumbs'+i] = new Swiper($(ele), {
spaceBetween: 10,
slidesPerView: 4,
});
var prev = $(ele).find('.swiper-button-prev');
var next = $(ele).find('.swiper-button-next');
//上一个
prev.on('click', function(e) {
e.preventDefault(