说明:获取音频和视频传达音频和视频传达任意数据MediaStream(akagetUserMedia)RTCPeerConnectionRTCDataChannel代表一种音频或者/和语音流.可以包含多个“tracks”通过navigator.getUserMedia()获取一个MediaStreamakagetUserMediaControlsthecontentsoftheMediaStreamMediatype,resolution,framerate 确保打开了Chrome浏览器里面abou
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