https://developers.weixin.qq.com/doc/offiaccount/OA_Web_Apps/Wechat_Open_Tag.html

提示玩 config:ok 之后，打开APP按钮 就消失了

<wx-open-launch-app
  id="launch-btn"
  appid="your-appid"
  extinfo="your-extinfo"
>
  <template>
    <style>.btn { padding: 12px }</style>
    <button class="btn">App内查看<button>
  </template>
</wx-open-launch-app>