如何将两个音频文件合并成一个文件，并在javascript中进行合并后播放

const audioContext = new AudioContext();

const audioFiles = ['audio1.mp3', 'audio2.mp3'];
const audioBuffers = [];

function loadAudio(url) {
  return fetch(url)
    .then(response => response.arrayBuffer())
    .then(buffer => audioContext.decodeAudioData(buffer))
    .catch(error => console.error('Error loading audio file:', error));
}

Promise.all(audioFiles.map(loadAudio))
  .then(buffers => {
    audioBuffers.push(...buffers);
    // 所有音频文件加载完成后执行合并和播放操作
    mergeAndPlay();
  });

function mergeBuffers(buffers) {
  const maxLength = Math.max(...buffers.map(buffer => buffer.length));
  const mergedBuffer = audioContext.createBuffer(
    buffers[0].numberOfChannels,
    maxLength,
    buffers[0].sampleRate
  );

  for (let channel = 0; channel < buffers[0].numberOfChannels; channel++) {
    const channelData = mergedBuffer.getChannelData(channel);
    buffers.forEach(buffer => {
      const bufferData = buffer.getChannelData(channel);
      for (let i = 0; i < bufferData.length; i++) {
        channelData[i] += bufferData[i];
      }
    });
  }

  return mergedBuffer;
}

function mergeAndPlay() {
  const mergedBuffer = mergeBuffers(audioBuffers);
  const source = audioContext.createBufferSource();
  source.buffer = mergedBuffer;
  source.connect(audioContext.destination);
  source.start();
}