audioPlayer.src怎设置media里面的mp3文件

import media from '@ohos.multimedia.media';
let audioPlayer = media.createAudioPlayer();
audioPlayer.src='fd://'+$r('app.media.muyu_sheng')

audioPlayer.on('play', () => {    //设置'play'事件回调
  console.log('audio play success');
  audioPlayer.play()
});