Flutter Web：如何在Flutter Web应用程序中禁用浏览器的向后按钮

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    /// Hope WillPopScope will do the job for you.
    return WillPopScope(
      onWillPop: () async => null,
      child: Scaffold(
        body: Center(
          child: Text('asd'),
        ),
      ),
    );
  }
}