根据URL显示特定的div或内容

// 安装React Router
// npm install react-router-dom

import React from 'react';
import { BrowserRouter as Router, Route, Switch, Link } from 'react-router-dom';

const Home = () => <div>Home Page</div>;
const About = () => <div>About Page</div>;
const Contact = () => <div>Contact Page</div>;

function 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>

        <Switch>
          <Route path="/" exact component={Home} />
          <Route path="/about" component={About} />
          <Route path="/contact" component={Contact} />
        </Switch>
      </div>
    </Router>
  );
}

export default App;