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lib/09/01/main.dart

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+import 'package:flutter/material.dart';
+
+import 'pages/page_a.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        appBarTheme: AppBarTheme(
+          elevation: 0,
+          iconTheme: IconThemeData(color: Colors.black),
+          titleTextStyle: TextStyle(color: Colors.black,fontSize: 18,fontWeight: FontWeight.bold)
+        )
+      ),
+      home:  const PageA(),
+    );
+  }
+}

lib/09/01/pages/page_a.dart

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+import 'package:flutter/material.dart';
+import 'page_b.dart';
+
+class PageA extends StatelessWidget {
+  const PageA({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffCCFFFF);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(title: const Text('A'),
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageB(context),
+          child: const Text('Push B'),
+        ),
+      ),
+    );
+  }
+
+  void toPageB(BuildContext context){
+    Navigator.of(context).push(MaterialPageRoute(builder: (_)=> const PageB()));
+  }
+}

lib/09/01/pages/page_b.dart

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+import 'package:flutter/material.dart';
+
+import 'page_c.dart';
+
+class PageB extends StatelessWidget {
+  const PageB({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffCCE5FF);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(title: const Text('B',),
+        backgroundColor: bgColor,
+      ),
+      body: Center(
+        child: ElevatedButton(
+          onPressed: ()=>toPageC(context),
+          child: const Text('Push C'),
+        ),
+      ),
+    );
+  }
+
+  void toPageC(BuildContext context){
+    Navigator.of(context).push(MaterialPageRoute(builder: (_)=> const PageC()));
+  }
+}

lib/09/01/pages/page_c.dart

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+import 'package:flutter/material.dart';
+
+class PageC extends StatelessWidget {
+  const PageC({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    const Color bgColor = Color(0xffFFE6CD);
+
+    return Scaffold(
+      backgroundColor: bgColor,
+      appBar: AppBar(
+        title: const Text('C'),
+        backgroundColor: bgColor,
+        leading: BackButton(
+          onPressed: (){
+            Navigator.of(context).pop();
+          },
+        ),
+      ),
+      body: const Center(
+        child: Text('到达终点'),
+      ),
+    );
+  }
+}