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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("button").click(function(){ $("li").removeClass(function(n) { if (n==0||n==1) {return "listitem"} else {return ""} }); }); }); </script> <style> .listitem { color:red; } </style> </head> <body> <h1>This is a heading</h1> <ul> <li class="listitem">Peter</li> <li class="listitem">Lois</li> <li class="listitem">Chris</li> <li class="listitem">Stewie</li> </ul> <button>Remove class "listitem" from the li elements with index 0 and 1</button> </body> </html>