如何在flutter web中将音频url转换为文件？

import 'dart:io';
import 'package:http/http.dart' as http;

Future<File> downloadAudioFile(String audioUrl) async {
  var response = await http.get(Uri.parse(audioUrl));
  var bytes = response.bodyBytes;
  var file = File('path_to_save_audio_file');
  await file.writeAsBytes(bytes);
  return file;
}

import 'dart:html' as html;

void playAudio(String audioFilePath) {
  html.AudioElement audio = html.AudioElement();
  audio.src = audioFilePath;
  audio.play();
}