1.sipwer的bug,如果数据是从网络上获取的,那么自动轮播到最后一张就会停止
2.解决方法在swiper组件上加上v-if="数据.length>0"
<template>
  <swiper ref="mySwiper" :options="swiperOptions" class="banner" v-if="banners.length>0">
    <swiper-slide v-for="value in banners" :key="value.bannerId" class="item">
      <a :href="value.url">
        <img :src="value.pic" alt="">
      </a>
    </swiper-slide>
    <div class="swiper-pagination" slot="pagination"></div>
  </swiper>
</template>
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