<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("input").keydown(function(event){
$("div").html("Key: " + event.which);
});
});
</script>
</head>
<body>
Enter your name: <input type="text">
<p>When you type in the field above, the div element below will display the key number.</p>
<div></div>
</body>
</html>