如何在Flutter web应用程序中保存和下载文本文件

import 'dart:html' as html;

void saveTextFile(String text, String fileName) {
  final blob = html.Blob([text]);
  final url = html.Url.createObjectUrlFromBlob(blob);
  final anchor = html.document.createElement('a') as html.AnchorElement
    ..href = url
    ..style.display = 'none'
    ..download = fileName;
  html.document.body.children.add(anchor);

  anchor.click();

  html.document.body.children.remove(anchor);
  html.Url.revokeObjectUrl(url);
}

saveTextFile('Hello, World!', 'example.txt');