如果变量不存在，则将路由器强制反应到另一个页面

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

const App = () => {
  const variableExists = true; // 假设这是一个变量，用来表示变量是否存在

  return (
    <Router>
      <Route exact path="/">
        {variableExists ? <HomePage /> : <Redirect to="/another-page" />}
      </Route>
      <Route path="/another-page">
        <AnotherPage />
      </Route>
    </Router>
  );
};

const HomePage = () => {
  return <h1>Home Page</h1>;
};

const AnotherPage = () => {
  return <h1>Another Page</h1>;
};

export default App;