怎么获取直播挂件展示的直播间房间号

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https://developers.weixin.qq.com/miniprogram/dev/platform-capabilities/industry/liveplayer/pendant.html#%E4%B8%80%E3%80%81-%E6%8C%82%E4%BB%B6%E5%8A%9F%E8%83%BD%E8%83%8C%E6%99%AF