设置format为aac时，在真机上返回的格式为m4a，在开发工具上返回的格式为aac，不知道这是不是bug？

var recorderManager = uni.getRecorderManager();
recorderManager.start({
  duration: 60000,
  sampleRate: 8000,
  numberOfChannels: 2,
  encodeBitRate: 48000,
  format: 'aac',
  audioSource: 'auto'
});
recorderManager.onStop(e => {
  if (this.recordStatus === 'success') {
    console.log(e.tempFilePath)
  }
});

setTimeout(() => {
  recorderManager.stop();
},3000)