shenweishi/node_modules/@vant/weapp/lib/sticky/index.wxml

<wxs src="../wxs/utils.wxs" module="utils" />
<wxs src="./index.wxs" module="computed" />

<view class="custom-class van-sticky" style="{{ computed.containerStyle({ fixed, height, zIndex }) }}">
  <view class="{{ utils.bem('sticky-wrap', { fixed }) }}" style="{{ computed.wrapStyle({ fixed, offsetTop, transform, zIndex }) }}">
    <slot />
  </view>
</view>