为特定路由指定不同根组件

npm install react-router-dom

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

import React from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
import Home from './components/Home';
import About from './components/About';
import NotFound from './components/NotFound';

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

export default App;

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

function Home() {
  return <h1>Home Page</h1>;
}

export default Home;

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

function About() {
  return <h1>About Page</h1>;
}

export default About;

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

function NotFound() {
  return <h1>404 Not Found</h1>;
}

export default NotFound;