React?? React.lazy? ??? ?? ??
?? ??? JavaScript ??? ? ?? ???? ??? React ??????? ??? ????? ?????. React? ???? ???? ?? ??? ???? ?? ?? ???? React.lazy? ?????. ?? ?? ??? ? ??????? ??? ???? ??? ? ????.
React.lazy?? ?? ??? ???? ??
- ?? ????: ES6 import()? ???? ?? ??? ???? ?????.
- ?? ??: ?? ? ?? ??? ??? ?? ?? ??? ????.
- ??? ??: ??? ???? ?? ??? ?????? ?????.
???
const LazyComponent = React.lazy(() => import('./LazyComponent')); function App() { return ( <React.Suspense fallback={<div>Loading...</div>}> <LazyComponent /> </React.Suspense> ); }
- React.lazy: ??? ?? ??? ???? ?????.
- ????: ????? ???? ?? ?? UI? ?????.
?? 1: React.lazy? ??? ?? ?? ??
?? ?? ??
import React from "react"; import HeavyComponent from "./HeavyComponent"; function App() { return ( <div> <h1>Main App</h1> <HeavyComponent /> </div> ); } export default App;
? ?? ????? ?? ???? ?? ???? ?? HeavyComponent? ?? ?? ?? ??? ?????.
?? ?? ??
import React, { Suspense } from "react"; const HeavyComponent = React.lazy(() => import("./HeavyComponent")); function App() { return ( <div> <h1>Main App</h1> <Suspense fallback={<div>Loading...</div>}> <HeavyComponent /> </Suspense> </div> ); } export default App;
?? HeavyComponent? ???? ?? ?????. ??? ?? ?? ??? ??? ?????.
?? 2: ??? ?? ??
?? ??? React Router? ???? ???? ?? ?? ??? ???? ?????.
import React, { Suspense } from "react"; import { BrowserRouter as Router, Routes, Route } from "react-router-dom"; const Home = React.lazy(() => import("./Home")); const About = React.lazy(() => import("./About")); const Contact = React.lazy(() => import("./Contact")); function App() { return ( <Router> <Suspense fallback={<div>Loading Page...</div>}> <Routes> <Route path="/" element={<Home />} /> <Route path="/about" element={<About />} /> <Route path="/contact" element={<Contact />} /> </Routes> </Suspense> </Router> ); } export default App;
??:
- ? ?? ????(Home, About, Contact)? ?? ??? ????? ?????.
? 3: ?? ???? ?? ??
??? ??? ???? ?? ??? ?? ?? ??? ?? ?????.
import React, { Suspense, useState } from "react"; const ComponentA = React.lazy(() => import("./ComponentA")); const ComponentB = React.lazy(() => import("./ComponentB")); function App() { const [showA, setShowA] = useState(false); const [showB, setShowB] = useState(false); return ( <div> <button onClick={() => setShowA(true)}>Load Component A</button> <button onClick={() => setShowB(true)}>Load Component B</button> <Suspense fallback={<div>Loading...</div>}> {showA && <ComponentA />} {showB && <ComponentB />} </Suspense> </div> ); } export default App;
React.lazy? ??? ?? ??
React? ??? ????? ?? ?? ?? ?? ??? ???? ????. ??? ???? ?? ??? ???? ??? ? ????.
const LazyComponent = React.lazy(() => import('./LazyComponent')); function App() { return ( <React.Suspense fallback={<div>Loading...</div>}> <LazyComponent /> </React.Suspense> ); }
?? ?? ?? ??
- ?? ?? ???? ??: ?? ??? ?? ??? ?? ???? ???? ????.
- ??? ??????: ???? ?? ???? ?? ??? ?? UI? ?????.
- ?? ?? ????: Webpack ?? ???? ?? ??? ???? ?? ?? ??? ?????.
- ??? ?? ??: ?? ?? ?? ?? ??? ?????. ??? ?? ??? HTTP ??? ??? ? ????.
?? ??? ????? ??
- Webpack: ?? ??? ?? ?? ????? ?????.
- Vite: ?? ??? ?? ?? ??? ?????.
- React Router: ?? ?? ?? ???? ?? ??? ? ????.
- React Loadable: ?? ??? ?? ??? ??? ?? ?? ????????.
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React.lazy? ??? ?? ??? ? ??? ????? ??? ?????. ?? ??? ???? ???? ?? ?? ??? ??? ??? ??? ??? ? ????. Suspense ? ??? ?? ??? ???? ????? ?? ??? React ??????? ???? ?? ??? ???? ?????.
? ??? React.lazy? ??? ?? ??: ? ?? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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