去除Flutter的debug标志

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Widget build(BuildContext context) {
  return MaterialApp(
    debugShowCheckedModeBanner: false,
    title: 'Flutter Demo',
    theme: ThemeData(
      primarySwatch: Colors.blue,
    ),
    home: MyHomePage(title: 'Flutter Demo Home Page'),
  );
}

主要就是这句话

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debugShowCheckedModeBanner: false,

显示的话改成true或者直接删掉

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debugShowCheckedModeBanner: true,