Сделали несколько страниц с отложенной загрузкой

package-lock.json

@@ -9,7 +9,8 @@
       "version": "0.0.0",
       "dependencies": {
         "react": "^19.1.0",
-        "react-dom": "^19.1.0"
+        "react-dom": "^19.1.0",
+        "react-router-dom": "^7.17.0"
       },
       "devDependencies": {
         "@eslint/js": "^9.25.0",
@@ -1600,6 +1601,19 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/cookie": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-1.1.1.tgz",
+      "integrity": "sha512-ei8Aos7ja0weRpFzJnEA9UHJ/7XQmqglbRwnf2ATjcB9Wq874VKH9kfjjirM6UhU2/E5fFYadylyhFldcqSidQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.6",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
@@ -2471,6 +2485,44 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/react-router": {
+      "version": "7.17.0",
+      "resolved": "https://registry.npmjs.org/react-router/-/react-router-7.17.0.tgz",
+      "integrity": "sha512-FDELK7rTMlCHO5+reyXsPlmfr7N1F91lPHsWYfMEGQm/KQ+F4JFM8jGoeQDmDvdTs93Fw9aSilH+uKRb4/jXvQ==",
+      "license": "MIT",
+      "dependencies": {
+        "cookie": "^1.0.1",
+        "set-cookie-parser": "^2.6.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=18",
+        "react-dom": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/react-router-dom": {
+      "version": "7.17.0",
+      "resolved": "https://registry.npmjs.org/react-router-dom/-/react-router-dom-7.17.0.tgz",
+      "integrity": "sha512-fyU2yjGups/hE6Xz0I5ZYbVL8Gx29eCjgpHaRaTaVU+OOAdfRX05KsvyRm0GO8YQwOkhpU3MurW1jyMUJn+zSw==",
+      "license": "MIT",
+      "dependencies": {
+        "react-router": "7.17.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=18",
+        "react-dom": ">=18"
+      }
+    },
     "node_modules/resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
@@ -2544,6 +2596,12 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/set-cookie-parser": {
+      "version": "2.7.2",
+      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.7.2.tgz",
+      "integrity": "sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==",
+      "license": "MIT"
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",

package.json

@@ -4,14 +4,15 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite", 
+    "dev": "vite",
     "build": "vite build",
     "lint": "eslint .",
     "preview": "vite preview"
   },
   "dependencies": {
     "react": "^19.1.0",
-    "react-dom": "^19.1.0"
+    "react-dom": "^19.1.0",
+    "react-router-dom": "^7.17.0"
   },
   "devDependencies": {
     "@eslint/js": "^9.25.0",

src/App.jsx

@@ -1,112 +1,28 @@
-import React from 'react'
+import { Suspense, lazy } from 'react'
+import { BrowserRouter, Routes, Route } from 'react-router-dom'
 
-class ErrorBoundary extends React.Component {
-    constructor(props) {
-        super(props);
-        this.state = {hasError: false};
-    }
-    
-    static getDerivedStateFromError(error) {
-        return { hasError: true }
-    }
-    
-    componentDidCatch(error,info) {
-        console.log(error,info);
-    }
-    
-    handlerReset = () => {
-        this.setState({hasError: false});
-    }
-    
-    render() {
-        if (this.state.hasError) {
-            return (
-                <div>
-                    <h1>Что то поломалось</h1>
-                    <button onClick={this.handlerReset}>Повторить</button>
-                </div>)
-        }
-        return this.props.children;
-    }
-}
-
-class AdvancedErrorBoundary extends React.Component {
-    constructor(props) {
-        super(props);
-        this.state = {
-            hasError: false,
-            error: null,
-            errorInfo: null
-        }
-    }
-    
-    static getDerivedStateFromError(error) {
-        return { hasErorr: true }
-    }
-    
-    componentDidCatch(error, info) {
-        this.setState({ 
-            error: error,
-            errorInfo: info
-        })
-    }
-    
-    handleReset = () => {
-        this.setState({
-            hasError:false,
-            error: null,
-            errorInfo:null
-        });
-    }
-    
-    render() {
-        if(this.state.hasError) {
-            console.log('Error');
-            return (
-                <div>
-                    <h2>Произошла ошибка</h2>
-                    <p>Извеняемся, работаем, исправляем. Разработчика привязали к батарее</p>
-                    <button onClick={this.handleReset}>Попробовать снова</button>
-                </div>
-            )
-        }
-        //Если ошибок нет, то рендрим дочерние объекты
-        return this.props.children
-    }
-}
-
-function ProblemComponent() {
-    const [counter,setCounter] = React.useState(0)
-    
-    const handlerClick = () => setCounter(counter + 1)
-    
-    React.useEffect(() => {
-        if (counter > 5) {
-            throw new Error("Ошибка в компоненте");
-        }
-    },[counter]);
-    return (
-        <div>
-            <h2>Счетчик: {counter}</h2>
-            <button onClick={handlerClick}>Прибавить</button>
-        </div>
-    )
-}
+const HomePage = lazy(() => import('./pages/HomePage'))
+const AboutPage = lazy(() => import('./pages/AboutPage'))
+const ContactPage = lazy(() => import('./pages/ContactPage'))
+const AdminPanel = lazy(() => import('./pages/AdminPanel'))
 
 function App() {
 	return (
-		<>
-			<h1>Обработка ошибок в компонентах</h1>
-            <ErrorBoundary>
-                <ProblemComponent />
-            </ErrorBoundary>
-            <ErrorBoundary>
-                <ProblemComponent />
-            </ErrorBoundary>
-            <ErrorBoundary>
-                <ProblemComponent />
-            </ErrorBoundary>
-		</>
+		<BrowserRouter>
+		    <div>
+                <nav><a href='/'>Главная</a> <a href='/about'>О нас</a> <a href='/contact'>Контакты</a></nav>
+                <main>
+                    <Suspense fallback={<div>Загрузка ...</div>}>
+                        <Routes>
+                            <Route path='/' element={<HomePage />} />
+                            <Route path='/about' element={<AboutPage />} />
+                            <Route path='/contact' element={<ContactPage />} />
+                            <Route path='/admin' element={<AdminPanel />} />
+                        </Routes>
+                    </Suspense>
+                </main>
+		    </div>
+		</BrowserRouter>
 	)
 }
 

src/pages/AboutPage.jsx

@@ -0,0 +1,9 @@
+export function MyComponent() {
+    return (
+        <>
+        <h1>About Page</h1>
+        </>
+        )
+}
+
+export default MyComponent

src/pages/AdminPanel.jsx

@@ -0,0 +1,9 @@
+export function MyComponent() {
+    return (
+        <>
+        <h1>Admin Page</h1>
+        </>
+        )
+}
+
+export default MyComponent

src/pages/ContactPage.jsx

@@ -0,0 +1,9 @@
+export function MyComponent() {
+    return (
+        <>
+        <h1>Contact Page</h1>
+        </>
+        )
+}
+
+export default MyComponent

src/pages/HomePage.jsx

@@ -0,0 +1,9 @@
+export function MyComponent() {
+    return (
+        <>
+        <h1>Home Page</h1>
+        </>
+        )
+}
+
+export default MyComponent