MediaStreamAudioSourceNode.MediaStreamAudioSourceNode()

var myAudioSource = new MediaStreamAudioSourceNode(context, options);

// define variables
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

// getUserMedia block - grab stream 获取音频流
// put it into a  把音频流放入 MediaStreamAudioSourceNode
if (navigator.mediaDevices.getUserMedia) {
  console.log("new getUserMedia supported.");
  navigator.mediaDevices
    .getUserMedia(
      // constraints: audio and video for this app
      {
        audio: true,
        video: false,
      },
    )
    .then(function (stream) {
      // Create a MediaStreamAudioSourceNode
      var options = {
        mediaStream: stream,
      };

      var source = new MediaStreamAudioSourceNode(audioCtx, options);
      source.connect(audioCtx.destination);
    })
    .catch(function (err) {
      console.log("The following gUM error occured: " + err);
    });
} else {
  console.log("new getUserMedia not supported on your browser!");
}