"react": "^17.0.2",
"react-dom": "^17.0.2",
"react-router-dom": "5.2.0",

这是我的 App.js 文件

import React from "react"
import Navbar from "./components/Navbar"
import Main from "./components/Main"
import Details from "./components/Details"

import { BrowserRouter as Switch, Router, Route, Link } from "react-router-dom"


export default function App() {
    return (
        <Router>
            <div className="container">
                <header>
                <ul>
                    <li><Link to="/navbar">Navbar</Link></li>
                    <li><Link to="/main">Home</Link></li>
                    <li><Link to="/details">Details</Link></li>
                </ul>

                <div>
                    <Switch>
                        <Route exact path="/navbar" component={Navbar} />
                        <Route exact path="/main" component={Main}/>
                        <Route exact path="/details" component={Details}/>
                    </Switch>
                </div>
                </header>
            </div>

        </Router>
    )
}