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? ? ????? JS ???? React.lazy? ??? ?? ??: ? ?? ??

React.lazy? ??? ?? ??: ? ?? ??

Dec 23, 2024 am 07:40 AM

Code Splitting with React.lazy: Enhance Your App’s Performance

React?? React.lazy? ??? ?? ??

?? ??? JavaScript ??? ? ?? ???? ??? React ??????? ??? ????? ?????. React? ???? ???? ?? ??? ???? ?? ?? ???? React.lazy? ?????. ?? ?? ??? ? ??????? ??? ???? ??? ? ????.


React.lazy?? ?? ??? ???? ??

  1. ?? ????: ES6 import()? ???? ?? ??? ???? ?????.
  2. ?? ??: ?? ? ?? ??? ??? ?? ?? ??? ????.
  3. ??? ??: ??? ???? ?? ??? ?????? ?????.

???

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>
  );
}

?? ?? ?? ??

  1. ?? ?? ???? ??: ?? ??? ?? ??? ?? ???? ???? ????.
  2. ??? ??????: ???? ?? ???? ?? ??? ?? UI? ?????.
  3. ?? ?? ????: Webpack ?? ???? ?? ??? ???? ?? ?? ??? ?????.
  4. ??? ?? ??: ?? ?? ?? ?? ??? ?????. ??? ?? ??? HTTP ??? ??? ? ????.

?? ??? ????? ??

  1. Webpack: ?? ??? ?? ?? ????? ?????.
  2. Vite: ?? ??? ?? ?? ??? ?????.
  3. React Router: ?? ?? ?? ???? ?? ??? ? ????.
  4. React Loadable: ?? ??? ?? ??? ??? ?? ?? ????????.

??

React.lazy? ??? ?? ??? ? ??? ????? ??? ?????. ?? ??? ???? ???? ?? ?? ??? ??? ??? ??? ??? ? ????. Suspense ? ??? ?? ??? ???? ????? ?? ??? React ??????? ???? ?? ??? ???? ?????.


? ??? React.lazy? ??? ?? ??: ? ?? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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