function App() {
  React.useEffect(() => {
    console.log('useEffect');
  }, []);

  return (
    <div>
      <h1>React StrictMode</h1>
      <p>這是一個 StrictMode 的測試範例</p>
    </div>
  );
}

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