见官方解决方案：Configuring the URL strategy on the web

启用 flutter_web_plugins

  1.   dependencies:
  2.     flutter_web_plugins:
  3.       sdk: flutter

创建配置文件 lib/configure_nonweb.dart

  1. void configureApp() {
  2.     // No-op.
  3. }

创建配置文件 lib/configure_web.dart

  1.   import 'package:flutter_web_plugins/flutter_web_plugins.dart';
  3.   void configureApp() {
  4.     setUrlStrategy(PathUrlStrategy());
  5.   }

在 lib/main.dart 中调用

  1.   import 'package:flutter/material.dart';
  2.   import 'configure_nonweb.dart' if (dart.library.html) 'configure_web.dart';
  4.   void main() {
  5.     configureApp();
  6.   runApp(MyApp());
  7.   }

运行项目即可