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>
posted on 2017-05-08 09:14 siegel 阅读(935) 评论(0) 编辑收藏举报