<!--pages/howtouse/howtouse.wxml-->
<swiper style="height: 100vh; width: 100vw;" indicator-dots="true">
  <block wx:for="{{imgUrls}}" wx:key="unique"  >
    <swiper-item style="height: 100vh; width: 100vw;">
      <image src="{{item}}" style="height: 100vh; width: 100vw;" mode="aspectFit" data-index="{{index}}" bindtap="previewImage"/>
    </swiper-item>
  </block>
</swiper>