JAVASCRIPT

hello world react

const App = () => {
 	return (
      <p>Hello, World!</p>
      )
}

reactjs hello world

reactjs hello world
===============================
npx create-react-app myapp
cd myapp
npm start
http://localhost:3000/
-----------------------------
* check version
node -v
npm -v
* npm upgrade
npm i -g npm-upgrade

react hello world

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<h1>Hello, world!</h1>);

hello world react

Page HTML :
    <div id = "root"> </div>

Page JS BABEL:
  ReactDOM.render(<h1> Hello , world ! </h1> , document.getElementById('root') );

Hello World in React

const root = ReactDOM.createRoot(
  document.getElementById('root')
);

function tick() {
  const element = (
    <div>
      <h1>Hello, world!</h1>
      <h2>It is {new Date().toLocaleTimeString()}.</h2>
    </div>
  );
  root.render(element);}

setInterval(tick, 1000);