如何从基于Javascript的webapp录制音频？

navigator.mediaDevices.getUserMedia({ audio: true })
  .then(function(stream) {
    // 处理音频流
  })
  .catch(function(err) {
    // 处理错误
  });

const audioContext = new AudioContext();
const source = audioContext.createMediaStreamSource(stream);

const destination = audioContext.createMediaStreamDestination();
source.connect(destination);

const mediaRecorder = new MediaRecorder(destination.stream);

mediaRecorder.ondataavailable = function(event) {
  // 处理音频数据
};

mediaRecorder.start();

mediaRecorder.stop();