<div id="app"></div>
function App (){
  const [count, setCount] = React.useState(0);

  // 請謹慎開啟註解,要有心理準備電腦會當機
  // React.useEffect(() => {
  //   setCount((pre) => pre + 1);
  // }, [ count ])
  
  return (
    <div>
      { count }
    </div>
  )
}

const app = document.querySelector('#app');
const root = ReactDOM.createRoot(app);
root.render(<App />);
View Compiled

External CSS

  1. https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/css/bootstrap.min.css

External JavaScript

  1. https://cdn.jsdelivr.net/npm/bootstrap@5.1.1/dist/js/bootstrap.bundle.min.js
  2. https://unpkg.com/react@18/umd/react.development.js
  3. https://unpkg.com/react-dom@18/umd/react-dom.development.js
  4. https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js