如何在App.js中处理多个路由？

npm install react-router-dom

yarn add react-router-dom

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

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

ReactDOM.render(<App />, document.getElementById('root'));