如何在路由切换时阻止整个项目的重新加载？

可以使用React的Suspense和React.lazy组件来实现动态加载组件，从而避免整个项目的重新加载。在组件加载之前，可以使用React的Context API来存储和共享全局状态。

示例代码：

//App.js

import React, { Suspense, lazy } from 'react'; import { BrowserRouter as Router, Route, Switch } from 'react-router-dom'; import Loading from './Loading'; import { UserProvider } from './UserContext';

const Home = lazy(() => import('./Home')); const About = lazy(() => import('./About'));

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

export default App;

//Home.js

import React from 'react'; import { Link } from 'react-router-dom'; import { useUser } from './UserContext';

function Home() { const { user } = useUser(); return ( <div> {user ? ( <h1>Welcome, {user}!</h1> ) : ( <h1>Welcome to the homepage!</h1> )} <Link to="/about">Go to About page</Link> </div> ); }

export default Home;

//About.js

import React from 'react'; import { Link } from 'react-router-dom'; import { useUser } from './UserContext';

function About() { const { user } = useUser(); return ( <div> <h1>About page</h1> {user ? ( <h2>Hello, {user}!</h2> ) : ( <h2>Please login</h2> )} <Link to="/">Go back to Home page</Link> </div> ); }

export default About;

//UserContext.js

import { createContext, useContext, useState } from 'react';

const UserContext = createContext();

export function UserProvider({ children }) { const [user, setUser] = useState(null); const value = { user, setUser }; return <UserContext.Provider value={value}>{children}</UserContext.Provider>; }

export function useUser() { const context = useContext(UserContext); if (!context) throw new Error('useUser must be used within a UserProvider'); const { user, setUser } = context; return { user, setUser }; }

//Loading.js

import React from 'react';

function Loading() { return <h1>Loading...</h1>; }

export default Loading;