Function App

Video 109/src/App.jsx:6–41

()

import './App.css'

function App() {
  const [count, setCount] = useState(0)
  const btnRef = useRef()

  useEffect(() => { 
    console.log(`First rendering..`) 
    btnRef.current.style.backgroundColor = "red"
  }, []);
  

  return (
    <>
      <div>
        <a href="https://vitejs.dev" target="_blank">
          <img src={viteLogo} className="logo" alt="Vite logo" />
        </a>
        <a href="https://react.dev" target="_blank">
          <img src={reactLogo} className="logo react" alt="React logo" />
        </a>
      </div>
      <h1>Vite + React</h1>
      <div className="card">
        <button ref={btnRef} onClick={() => setCount((count) => count + 1)}>
          count is {count}
        </button>
        <p>
          Edit <code>src/App.jsx</code> and save to test HMR
        </p>
      </div>
      <p className="read-the-docs">
        Click on the Vite and React logos to learn more
      </p>
      <button onClick={()=>{btnRef.current.style.display = "none"}}>Change me</button>
    </>
  )
}

export default App