<view
  class="back-top {{ show ? '' : 'back-top-hide' }}"
  style="z-index: {{ zIndex }}; right: {{ right }}rpx; bottom: {{ bottom }}rpx"
  bind:tap="scrollToTop"
>
  <!-- <iconfont name="top" size="90" /> -->
  <van-icon name="arrow-up" size="24" />
</view>
