如何使用React中的条件语句有效地管理不同的路由？

npm install react-router-dom

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

function App() {
  return (
    <Router>
      <div>
        <nav>
          <ul>
            <li>
              <Link to="/">首页</Link>
            </li>
            <li>
              <Link to="/about">关于</Link>
            </li>
            <li>
              <Link to="/contact">联系我们</Link>
            </li>
          </ul>
        </nav>

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

function Home() {
  return <h2>首页</h2>;
}

function About() {
  return <h2>关于</h2>;
}

function Contact() {
  return <h2>联系我们</h2>;
}