<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("input").keydown(function(){ $("input").css("background-color", "yellow"); }); $("input").keyup(function(){ $("input").css("background-color", "pink"); });});</script></head><body>Enter your name: <input type="text"><p>Enter your name in the input field above. It will change background color on keydown and keyup.</p></body></html>