<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>
<script> var btn = document.getElementById('launch-btn');
  btn.addEventListener('launch', function (e) {
console.log('success');
  });
  btn.addEventListener('error', function (e) {
console.log('fail', e.detail);
  }); </script> 

<div class="center" style="width: 100%" ref="launchBtnHome">
      <wx-open-launch-weapp id="launch-btn" username="gh_xxxxxxxx" path="pages/index/index/index" ref="launchBtn">
        <script type="text/wxtag-template">
          <style>
            .jump-btn {
              height: 44px;
              line-height: 44px;
              border: none;
              font-size: 16px;
              color: #ffffff;
              background-color: #f94048;
              text-align: center;
            }
          </style>
          <div class="jump-btn">打开小程序</div>
        </script>
      </wx-open-launch-weapp>
    </div>