【swiper获取索引值】swiper3在loop下获取当前索引值

一、问题描述

swiper3中没有realIndex属性，不能直接获取。需通过activeIndex转化

二、具体代码

html部分：

 <div class=" case swiper-container">
    <div class="swiper-wrapper">
      <div class="swiper-slide	">Slide 1</div>
      <div class="swiper-slide"	>Slide 2</div>
      <div class="swiper-slide	">Slide 3</div>
    </div>   
  </div>

js部分：

<script>
   var myswiper = new Swiper('.case.swiper-container', {
    
    //一个页面出现多个swiper插件，.case以区别
     slidesPerView: 3,
     spaceBetween: 30,
     loop:true,
     loopAdditionalSlides : 0, 
     onSlideChangeEnd: function(swiper){
    
    
     //(swiper.activeIndex-1+i)%(i))
     alert((swiper.activeIndex-1+3)%(3)); //切换结束时，打印当前索引
	},
});
 </script>