javascript

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Test</title>
</head>
<body>
    <p id="paragrafos"></p>
    <button onclick="clickFunction()">Κάνε κλίκ</button>
    <script>
        function clickFunction(){
            document.getElementById('paragrafos').innerHTML = "Γεια σου Αντώνη"
        }
    </script>
</body>
</html>