getAllResponseHeaders() 必须放到onload里面

<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>
巴特西

getAllResponseHeaders() 必须放到onload里面

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