wx-open-launch-weapp在javascript不显示是怎么回事？

代码是按照官网文档写的，直接把官网文档代码粘贴进去也不显示

<wx-open-launch-weapp
  id="launch-btn"
  username="gh_xxxxxxxx"
  path="pages/home/index.html?user=123&action=abc"
>
  <template>
    <style>.btn { padding: 12px }</style>
    <button class="btn">打开小程序</button>
  </template>
</wx-open-launch-weapp>