隐藏右上角的debug角标

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo', //应用名
      debugShowCheckedModeBanner: false,    //隐藏debug的角标
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Hello Flutter'),
    );
  }
}