<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>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>