const App = () => {
  return (
  <div>
    <div>Boolean：{ true }</div>
    
    <div>Boolean：{ false }</div>
 
    <div>Null：{ null }</div>

    <div>Undefined：{ undefined }</div>
  </div>
  )
}
const root = ReactDOM.createRoot(document.querySelector('#root'));
root.render(<App />);