

根据文档可以获知指定deviceId,获取指定的设备,文档地址:MediaDevices.getUserMedia() - Web APIs | MDNThe MediaDevices.getUserMedia() method prompts the user for permission to use a media input which produces a MediaStream with tracks containing the requested types of media.
https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/

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