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(){ $.ajaxSetup({url:"demo_ajax_load.txt",success:function(result){ $("div").html(result);}}); $.ajax(); }); }); </script> </head> <body> <div><h2>Let AJAX change this text</h2></div> <button>Change Content</button> </body> </html>
Result:
W3Schools.com - Try it yourself