正在使用express服务器发送的歌曲缓冲区设置% audio.currentTIme；

app.get('/song', (req, res) => {
  const songPath = 'path/to/song.mp3';
  const stat = fs.statSync(songPath);
  const fileSize = stat.size;

  const range = req.headers.range;
  if (range) {
    const parts = range.replace(/bytes=/, "").split("-");
    const start = parseInt(parts[0], 10);
    const end = parts[1] ? parseInt(parts[1], 10) : fileSize - 1;
    const chunkSize = (end - start) + 1;
    const file = fs.createReadStream(songPath, { start, end });
    const headers = {
      'Content-Range': `bytes ${start}-${end}/${fileSize}`,
      'Accept-Ranges': 'bytes',
      'Content-Length': chunkSize,
      'Content-Type': 'audio/mpeg',
    };
    res.writeHead(206, headers);
    file.pipe(res);
  } else {
    const headers = {
      'Content-Length': fileSize,
      'Content-Type': 'audio/mpeg',
    };
    res.writeHead(200, headers);
    fs.createReadStream(songPath).pipe(res);
  }
});