async function main() {
  const streamID = await tt.requestMicrophone();
  const context = tt.getAudioContext();
  const sourceNode = context.createMediaStreamSource(streamID);
  sourceNode.isSampleSource = true; //设置该参数，可以在录屏时带上麦克风声音源
  /**
   * 检测音量以确认麦克风确实起效了
   */
  const volumeDetectionNode = context.createVolumeDetection();
  sourceNode.connect(volumeDetectionNode);
  volumeDetectionNode.connect(context.destination);
  setInterval(() => {
    const { size, data } = volumeDetectionNode.getVolumeDetectionData();
    const averageVolume =
      data.reduce((prev, volume) => prev + volume, 0) / size;
    console.log(`[API: microphone] average volumn: ${averageVolume}`);
  }, 2000);
}
main();
/* 
  输出：
  [API: microphone] average volumn: 0.000010016467299465149
  [API: microphone] average volumn: 0.000004972311089659343
  ...
*/