如何使用typescript在html5中播放浏览文件的音频？

// HTML
<input type="file" id="fileInput">
<button id="playButton">播放</button>

// TypeScript
document.getElementById('fileInput').addEventListener('change', (event) => {
  const file = (event.target as HTMLInputElement).files[0];
  const reader = new FileReader();
  reader.onload = (e) => {
    const audioSrc = (e.target as FileReader).result;
    const audio = new Audio(audioSrc);
    document.getElementById('playButton').addEventListener('click', () => {
      audio.play();
    });
  };
  reader.readAsDataURL(file);
});