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前言

我将Flutter版本从3.19.3升级到3.24.0后我启动了以前可以运行的Flutter Web程序，结果页面空白并在控制台出现如下错误

Warning: In index.html:38: Local variable for "serviceWorkerVersion" is deprecated. Use "{{flutter_service_worker_version}}" template token instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details.
Warning: In index.html:61: "FlutterLoader.loadEntrypoint" is deprecated. Use "FlutterLoader.load" instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details.
Restarted appl

解决办法

如果项目在Flutter3.21或更早的版本中创建，则要进行如下步骤解决这个问题

1.删除web文件夹

2.在项目根目录执行以下命令，就会重新生成web文件夹，如果web/index.html有做额外的配置，还需要再手动配置一下

flutter create . --platforms=webflutter clean
flutter pub get