React 路由

React 路由通常使用 react-router 库来实现，它是一个功能强大的库，用于在 React 应用程序中实现客户端路由。以下是关于如何在 React 中使用 React Router 的详细说明：

安装 React Router

首先，你需要安装 react-router-dom 包，这是用于在浏览器环境中实现路由的包。

npm install react-router-dom

基本用法

以下是使用 React Router 设置基本路由的步骤和示例代码。

1. 创建基础路由组件

首先，创建一些简单的组件，它们将被路由渲染。

实例

import React from 'react';

const Home = () => {
return <h2>Home</h2>;
};

export default Home;

// About.js
import React from 'react';

const About = () => {
return <h2>About</h2>;
};

export default About;

// Contact.js
import React from 'react';

const Contact = () => {
return <h2>Contact</h2>;
};

export default Contact;

2. 设置路由

在你的主应用组件中，使用 react-router-dom 的组件来设置路由。

实例

import React from 'react';
import ReactDOM from 'react-dom/client';
import {
BrowserRouter as Router,
Routes,
Route,
Link
} from 'react-router-dom';

import Home from './Home';
import About from './About';
import Contact from './Contact';

const App = () => {
return (
<Router>
<div>
<nav>
<ul>
<li>
<Link to="/">Home</Link>
</li>
<li>
<Link to="/about">About</Link>
</li>
<li>
<Link to="/contact">Contact</Link>
</li>
</ul>
</nav>
<Routes>
<Route path="/" element={<Home />} />
<Route path="/about" element={<About />} />
<Route path="/contact" element={<Contact />} />
</Routes>
</div>
</Router>
);
};

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);

嵌套路由

React Router 允许你创建嵌套路由，这样可以在一个组件内渲染更多的路由。

实例

// Dashboard.js
import React from 'react';
import { Link, Outlet } from 'react-router-dom';

const Dashboard = () => {
return (
<div>
<h2>Dashboard</h2>
<nav>
<ul>
<li>
<Link to="profile">Profile</Link>
</li>
<li>
<Link to="settings">Settings</Link>
</li>
</ul>
</nav>
<Outlet />
</div>
);
};

export default Dashboard;

实例

// Profile.js
import React from 'react';

const Profile = () => {
return <h2>Profile</h2>;
};

export default Profile;

实例

// Settings.js
import React from 'react';

const Settings = () => {
return <h2>Settings</h2>;
};

export default Settings;

在主应用组件中设置嵌套路由：

实例

import React from 'react';
import ReactDOM from 'react-dom/client';
import {
BrowserRouter as Router,
Routes,
Route,
Link
} from 'react-router-dom';

import Home from './Home';
import About from './About';
import Contact from './Contact';
import Dashboard from './Dashboard';
import Profile from './Profile';
import Settings from './Settings';

const App = () => {
return (
<Router>
<div>
<nav>
<ul>
<li>
<Link to="/">Home</Link>
</li>
<li>
<Link to="/about">About</Link>
</li>
<li>
<Link to="/contact">Contact</Link>
</li>
<li>
<Link to="/dashboard">Dashboard</Link>
</li>
</ul>
</nav>
<Routes>
<Route path="/" element={<Home />} />
<Route path="/about" element={<About />} />
<Route path="/contact" element={<Contact />} />
<Route path="/dashboard" element={<Dashboard />}>
<Route path="profile" element={<Profile />} />
<Route path="settings" element={<Settings />} />
</Route>
</Routes>
</div>
</Router>
);
};

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);

动态路由

可以在路径中包含动态参数。

实例

// User.js
import React from 'react';
import { useParams } from 'react-router-dom';

const User = () => {
const { userId } = useParams();
return <h2>User ID: {userId}</h2>;
};

export default User;

在主应用组件中设置动态路由：

实例

import React from 'react';
import ReactDOM from 'react-dom/client';
import {
BrowserRouter as Router,
Routes,
Route,
Link
} from 'react-router-dom';

import Home from './Home';
import About from './About';
import Contact from './Contact';
import Dashboard from './Dashboard';
import Profile from './Profile';
import Settings from './Settings';
import User from './User';

const App = () => {
return (
<Router>
<div>
<nav>
<ul>
<li>
<Link to="/">Home</Link>
</li>
<li>
<Link to="/about">About</Link>
</li>
<li>
<Link to="/contact">Contact</Link>
</li>
<li>
<Link to="/dashboard">Dashboard</Link>
</li>
<li>
<Link to="/user/1">User 1</Link>
</li>
<li>
<Link to="/user/2">User 2</Link>
</li>
</ul>
</nav>
<Routes>
<Route path="/" element={<Home />} />
<Route path="/about" element={<About />} />
<Route path="/contact" element={<Contact />} />
<Route path="/dashboard" element={<Dashboard />}>
<Route path="profile" element={<Profile />} />
<Route path="settings" element={<Settings />} />
</Route>
<Route path="/user/:userId" element={<User />} />
</Routes>
</div>
</Router>
);
};

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);

404 页面

可以使用 React Router 提供的 Navigate 组件来实现 404 页面重定向。

实例

import React from 'react';
import ReactDOM from 'react-dom/client';
import {
BrowserRouter as Router,
Routes,
Route,
Link,
Navigate
} from 'react-router-dom';

import Home from './Home';
import About from './About';
import Contact from './Contact';
import Dashboard from './Dashboard';
import Profile from './Profile';
import Settings from './Settings';
import User from './User';

const NotFound = () => {
return <h2>404 Page Not Found</h2>;
};

const App = () => {
return (
<Router>
<div>
<nav>
<ul>
<li>
<Link to="/">Home</Link>
</li>
<li>
<Link to="/about">About</Link>
</li>
<li>
<Link to="/contact">Contact</Link>
</li>
<li>
<Link to="/dashboard">Dashboard</Link>
</li>
<li>
<Link to="/user/1">User 1</Link>
</li>
<li>
<Link to="/user/2">User 2</Link>
</li>
</ul>
</nav>
<Routes>
<Route path="/" element={<Home />} />
<Route path="/about" element={<About />} />
<Route path="/contact" element={<Contact />} />
<Route path="/dashboard" element={<Dashboard />}>
<Route path="profile" element={<Profile />} />
<Route path="settings" element={<Settings />} />
</Route>
<Route path="/user/:userId" element={<User />} />
<Route path="*" element={<Navigate to="/" replace />} />
</Routes>
</div>
</Router>
);
};

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);

小结

通过使用 React Router，你可以轻松地在 React 应用中实现路由功能，包括基本路由、嵌套路由、动态路由以及 404 页面等。通过这种方式，你可以创建一个功能强大且用户友好的单页应用程序 (SPA)。

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