我无法从Primereact菜单更改路由

npm install react-router-dom

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

import { Link } from 'react-router-dom';

function Menu() {
  return (
    <div>
      <ul>
        <li>
          <Link to="/">Home</Link>
        </li>
        <li>
          <Link to="/about">About</Link>
        </li>
      </ul>
    </div>
  );
}

function App() {
  return (
    <Router>
      <div>
        <Menu />
        <Switch>
          <Route exact path="/">
            <Home />
          </Route>
          <Route path="/about">
            <About />
          </Route>
        </Switch>
      </div>
    </Router>
  );
}

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

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