官方文档：https://developers.weixin.qq.com/miniprogram/dev/component/swiper.html

  <swiper indicator-color="ivory" indicator-active-color="#d43c33" indicator-dots autoplay>
      <swiper-item>
          <image src="/images/banner1.png" mode=""/>
      </swiper-item>
      <swiper-item>
          <image src="/images/banner2.png" mode=""/>
      </swiper-item>
  </swiper>

swiper{
  height: 480rpx;
}
swiper-item image{
  width: 100%;
  height: 100%;
}