Untitled

<!DOCTYPE html>
<html>
<head>
    <title>Interface dengan JS (M. Hafidz Fadillah - XI RPL 2)</title>
    <link rel="stylesheet" type="text/css" href="interface.css">
</head>
<div class="bgtest">
<body>
<p id="coba">
    <script type="text/javascript">
        function sayHalo() {
            var nm = document.getElementById('nama').value;
            alert("Halo, "+nm);
        }
    </script>
    <label>Tulis di sini</label>
    <input type="text" id="nama" onchange="sayHalo();">
</p>
</body>
</div>
</html>