<html><head> <meta charset="utf-8"> <title>test</title> <!-- <script type="text/javascript" src="http://img.kuaixun360.com/Public/Home/js/jquery-1.11.3.min.js?v=2.1.12.68"> </script>--> </head> <body> <div> <input type="button" value="Req" onclick="testXMLHttpRequest();"/> </div> </body> <script> function testXMLHttpRequest() { function createCORSRequest(method, url) { var xhr = new XMLHttpRequest(); // alert(xhr.readyState) if ("withCredentials" in xhr) { xhr.open(method, url, true) } else if (typeof XDomainRequest != "undefined") { var xhr = new XDomainRequest(); xhr.open(method, url) } else { xhr = null; } return xhr; } var request = createCORSRequest("get", "http://cdn.bootcss.com/jquery/1.11.2/jquery.min.js"); if (request) { request.onload = function () { alert(request.readyState); alert(request.getAllResponseHeaders()); console.log(request) } request.onerror = function () { alert("error") } //alert(request.getAllResponseHeaders()); request.send(); } } </script> </html>