<script src="livesdk.umd.js"></script>
<script>
  const sdk = new LiveSDK.LiveSDK({
    activityId: '...',
    token: '...',
    merchantId: '...'
  });
  // 清晰度插件（opt-in）：开启「更多」面板清晰度入口 + 自动降级
  sdk.use(new LiveSDK.DefinitionPlugin());
  sdk.mount('#live-container');
</script>