第二十章：Suspense + lazy —— 空调模块按需安装

const AirPurifierPanel = lazy(() => import('./AirPurifierPanel'));

function SmartHome() {
  const [showPurifier, setShowPurifier] = useState(false);

  return (
    <div>
      <button onClick={() => setShowPurifier(true)}>打开空气净化模块</button>

      {showPurifier && (
        <Suspense fallback={<p>正在安装净化模块...</p>}>
          <AirPurifierPanel />
        </Suspense>
      )}
    </div>
  );
}