React 18 鏂扮壒鎬ц瑙?/h1>

2026骞?鏈?1鏃?/span> 骞冲钩 鍓嶇鎶€鏈?/span> React,鍓嶇,鏂扮壒鎬?/span>

绀轰緥锛氫娇鐢?createRoot

// React 17
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

// React 18
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>
);

鑷姩鎵瑰鐞嗙ず渚?/h4>

// React 17 涓紝杩欎簺鏇存柊涓嶄細琚壒澶勭悊
fetch('https://api.example.com/data')
  .then(() => {
    setCount(c => c + 1); // 瑙﹀彂娓叉煋
    setFlag(f => !f); // 瑙﹀彂鍙︿竴娆℃覆鏌?  });

// React 18 涓紝杩欎簺鏇存柊浼氳鎵瑰鐞?fetch('https://api.example.com/data')
  .then(() => {
    setCount(c => c + 1);
    setFlag(f => !f);
    // 鍙Е鍙戜竴娆℃覆鏌?  });

骞跺彂 Suspense 绀轰緥

function App() {
  return (
    <Suspense fallback={<Loading />}
      <div>
        <Header />
        <Suspense fallback={<PostSkeleton />}
          <Posts />
        </Suspense>
        <Footer />
      </div>
    </Suspense>
  );
}

SuspenseList 绀轰緥

import { Suspense, SuspenseList } from 'react';

function App() {
  return (
    <SuspenseList revealOrder="forwards" tail="collapsed">
      <Suspense fallback={<Loading />}
        <Profile />
      </Suspense>
      <Suspense fallback={<Loading />}
        <Posts />
      </Suspense>
      <Suspense fallback={<Loading />}
        <Comments />
      </Suspense>
    </SuspenseList>
  );
}

useId 绀轰緥

import { useId } from 'react';

function Input() {
  const id = useId();
  return (
    <div>
      <label htmlFor={id}>鐢ㄦ埛鍚?lt;/label>
      <input id={id} type="text" />
    </div>
  );
}

useTransition 绀轰緥

import { useTransition, useState } from 'react';

function Search() {
  const [isPending, startTransition] = useTransition();
  const [query, setQuery] = useState('');
  const [results, setResults] = useState([]);

  function handleSearch(e) {
    const newQuery = e.target.value;
    setQuery(newQuery);
    
    startTransition(() => {
      // 杩欐槸涓€涓綆浼樺厛绾ф洿鏂?      setResults(searchData(newQuery));
    });
  }

  return (
    <div>
      <input type="text" value={query} onChange={handleSearch} />
      {isPending ? <div>鎼滅储涓?..</div> : <Results results={results} />}
    </div>
  );
}

useDeferredValue 绀轰緥

import { useDeferredValue, useState } from 'react';

function SearchResults() {
  const [query, setQuery] = useState('');
  const deferredQuery = useDeferredValue(query);
  const results = useMemo(() => searchData(deferredQuery), [deferredQuery]);

  return (
    <div>
      <input type="text" value={query} onChange={(e) => setQuery(e.target.value)} />
      <Results results={results} />
    </div>
  );
}