InterfaceTexttoAlert

<!DOCTYPE html>
<html>
<head>
    <title>Davitra Eka S XI RPL 2</title>
</head>
<body>
    <p id="coba"></p>
    <script type="text/javascript">
        function sayHello()
        {
            var nm = document.getElementById('nama').value;
            alert("halo, " + nm);
        }
    </script>
    <label>Tulis nama disini</label>
    <input type="text" name="nama" id="nama" onchange="sayHello();">
</body>
</html>