Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script src="../../ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("#w3s").attr("href", function(i,origValue){ return origValue + "/jquery"; }); }); }); </script> </head> <body> <p><a href="../default.htm" id="w3s">W3Schools.com</a></p> <button>Change href Value</button> <p>Mouse over the link (or click on it) to see that the value of the href attribute has changed.</p> </body> </html>
Result:
W3Schools.com - Try it yourself