JS Events

<!DOCTYPE html>
<html>
<head>
<title> Javascript onkeydown Event Handler  </title>
</head>
<body>
<h1>Event handler<h1>
<h2>Sample Output</h2>
<input type="text" id="demo" onkeydown="func1()"
>
<script>
function func1() {
var keyCode = ('which' in event) ? event.which : event.keyCode;
alert ("The Unicode key code is: " + keyCode);
}
</script>
</body>
</html>