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swiper官方网址：点击查看
线上demo：点击查看
核心方法，在当前Slide切换到另一个Slide时执行：
<script language="javascript"> var mySwiper = new Swiper('.swiper-container',{ on:{ slideChange: function(){ alert('改变了，activeIndex为'+this.activeIndex); }, }, }) </script>
详见：https://www.swiper.com.cn/api/event/405.html
完整代码：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha256-pasqAKBDmFT4eHoN2ndd6lN370kFiGUFyTiUHWhU7k8=" crossorigin="anonymous"></script> <link rel="stylesheet" href="https://unpkg.com/swiper/css/swiper.min.css"> <script src="https://unpkg.com/swiper/js/swiper.min.js"> </script> </head> <body> <div class="swiper-container temp"> <div class="swiper-wrapper"> <div class="swiper-slide"> 1 </div> <div class="swiper-slide"> 2 </div> <div class="swiper-slide"> 3 </div> </div> </div> </body> <script> var now_ActiveIndex = 2; //,//当前所在下标 var tempSwiper = new Swiper('.swiper-container.temp', { initialSlide: 1, loop: true, speed: 400, on: { slideChange: function (swiper) { //当前Slide切换时执行(activeIndex发生改变) var pre_number = Number($(this.slides[now_ActiveIndex]).text()); //获取当前页数字 if (now_ActiveIndex > this.activeIndex) { //如果当前数字大于索引,索引区间范围1~4 if (now_ActiveIndex == 4 && this.activeIndex == 1) { //swiper回到第一页 $(this.slides[this.activeIndex]).text(pre_number); } else { //上一个 var act_number = pre_number - 1; $(this.slides[this.activeIndex]).text(act_number); } } else if (now_ActiveIndex < this.activeIndex) { if (now_ActiveIndex == 0 && this.activeIndex == 3) { $(this.slides[this.activeIndex]).text(pre_number); } else { //下一个 var act_number = pre_number + 1; $(this.slides[this.activeIndex]).text(act_number); } } now_ActiveIndex = this.activeIndex; }, }, }) </script> <style> .temp{ 100%; height: 200px; background: #ccc; } .swiper-slide{ display: block; 100%; height: 100%; text-align: center; line-height:200px; font-size: 30px; } </style> </html>
如要模拟异步请求，可使用mySwiper.allowSlideNext，mySwiper.allowSlidePrev，mySwiper.allowTouchMove配合使用。