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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Hello React!</title>
</head>
<body>
<div id="root"></div>
<script src="https://unpkg.com/react@18/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
<script>
function App() {
//const time = new Date().toLocaleTimeString();
const [time, setTime] = React.useState(new Date().toLocaleTimeString());
React.useEffect(function () {
setInterval(function () {
setTime(new Date().toLocaleTimeString());
}, 1000);
}, []);
return React.createElement("header", null, `Hello React! It's ${time}`);
}
const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(React.createElement(App));
</script>
</body>
</html>