微信开放标签如何跳转到体验版小程序?

帐号原始ID gh_xx，正式版，体验版都是一样的。

<wx-open-launch-weapp
  id="launch-btn"
  username="gh_xxxx"
  path="pages/index/index"
>
  <script type="text/wxtag-template">
    {/* <style>.btn { padding: 12px }</style> */}
    <button ref={button} class="btn">
      打开小程序
    </button>
  </script>
</wx-open-launch-weapp>