<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $(document).ajaxError(function(e, xhr, opt){ alert("Error requesting " + opt.url + ": " + xhr.status + " " + xhr.statusText); }); $("button").click(function(){ $("div").load("wrongfile.txt"); });});</script></head><body><div><h2>Let AJAX change this text</h2></div><button>Change Content</button></body></html>