如何在react导航中更改默认的后台屏幕

// 1. 导入所需的库和组件
import React from 'react';
import { BrowserRouter as Router, Switch, Route, Link } from 'react-router-dom';

// 3. 创建导航组件
const Navigation = () => {
  return (
    <nav>
      <ul>
        <li>
          <Link to="/">Home</Link>
        </li>
        <li>
          <Link to="/dashboard">Dashboard</Link>
        </li>
        <li>
          <Link to="/profile">Profile</Link>
        </li>
      </ul>
    </nav>
  );
};

// 2. 设置路由
const App = () => {
  return (
    <Router>
      <div>
        <Navigation />

        <Switch>
          <Route exact path="/" component={Home} />
          <Route path="/dashboard" component={Dashboard} />
          <Route path="/profile" component={Profile} />
        </Switch>
      </div>
    </Router>
  );
};

// 示例页面组件
const Home = () => <h1>Home</h1>;
const Dashboard = () => <h1>Dashboard</h1>;
const Profile = () => <h1>Profile</h1>;

export default App;