使用 React Router v6 进行布局

npm i -d react-router-dom@latest

// app.js
import react from 'react';
import { browserrouter as router, routes, route } from 'react-router-dom';
import layout from './layout';
import home from './home';
import about from './about';
import contact from './contact';

function app() {
  return (
    <router><routes><route path="/" element="{&lt;layout"></route>}&gt;
          <route index element="{&lt;home"></route>} /&gt;
          <route path="/about" element="{&lt;about"></route>} /&gt;
          <route path="/contact" element="{&lt;contact"></route>} /&gt;
        
      </routes></router>
  );
}

export default app;

// layout.js
import react from 'react';
import { outlet } from 'react-router-dom';

function layout() {
  return (
    <div>
      <header><h1>my app</h1>
        <nav><ul>
<li><a href="/">home</a></li>
            <li><a href="/about">about</a></li>
            <li><a href="/contact">contact</a></li>
          </ul></nav></header><main><outlet></outlet></main>
</div>
  );
}

export default layout;

// home.js
import react from 'react';

function home() {
  return (
    <div>
      <h2>home page</h2>
      <p>welcome to the home page!</p>
    </div>
  );
}

export default home;

// about.js
import react from 'react';

function about() {
  return (
    <div>
      <h2>about page</h2>
      <p>learn more about us!</p>
    </div>
  );
}

export default about;

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

function Contact() {
  return (
    <div>
      <h2>Contact Page</h2>
      <p>Reach out to us!</p>
    </div>
  );
}

export default Contact;