<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("ul li:first").hide(); });});</script></head><body><p>List 1:</p><ul> <li>Coffee</li> <li>Milk</li> <li>Tea</li></ul><p>List 2:</p><ul> <li>Coffee</li> <li>Milk</li> <li>Tea</li></ul><button>Click me</button></body></html>