​x
 
<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
i=0;
$(document).ready(function(){
  $("input").keypress(function(){
    $("span").text(i+=1);
  });
});
</script>
</head>
<body>
Enter your name: <input type="text" />
<p>Keypresses:<span>0</span></p>
</body>
</html>
​