C#转Javascript提示'Access-Control-Allow-Origin' header is present on the requested

    <script type="text/javascript">

        $(function () {

            var settings = {

                "async": true,

                "crossDomain": true,

                "url": "http://192.168.1.60/ISAPI/System/Video/inputs/channels/1/overlays/text",

                "method": "PUT",

                "headers": {

                    "Access-Control-Allow-Origin": "*",

                    "Authorization": "Basic YWRtaW46enp4eTEyMzQ1Ng==",

                    "cache-control": "no-cache",

                    "Postman-Token": "0c288f09-09c6-4088-b79b-c969b2833124"

                },

                "data": "  <TextOverlayList size=\"500\">    <TextOverlay>      <id>1</id>      <enabled>true</enabled>      <positionX>10</positionX>      <positionY>70</positionY>      <displayText>东风4-1868  11/小时  DK200+509</displayText>    </TextOverlay>  </TextOverlayList>"

            }



            $.ajax(settings).done(function (response) {

                layer.msg("<span style='color:#ffffff;'>己更新！</span>");

            });

        });

    </script>

       

            string URI = "http://192.168.1.60/ISAPI/System/Video/inputs/channels/1/overlays/text";

            Stream outstream = null;

            Stream instream = null;

            StreamReader sr = null;



            //新版定义HTTP的请求，不能用new，https://msdn.microsoft.com/zh-cn/library/system.net.httpwebresponse(v=vs.110).aspx

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(URI);

            // 要注意的这是这个编码方式，还有内容的Xml内容的编码方式

            Encoding encoding = Encoding.GetEncoding("UTF-8");

            byte[] data = System.Text.Encoding.UTF8.GetBytes(xmlPath);

            req.Method = "PUT";

            req.ContentType = "text/plain;charset=UTF-8";

            //添加用户名密码完成Authorization认证

            string username = "admin";

            string password = "zzxy123456"; 

            string userPasswd = username + ":" + password;

            CredentialCache mycache = new CredentialCache();

            mycache.Add(new Uri(URI), "Basic", new NetworkCredential(username, password));

            req.Credentials = mycache;

            req.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(userPasswd)));

            //发送内容

            outstream = req.GetRequestStream();

            outstream.Write(data, 0, data.Length);

            outstream.Flush();

            outstream.Close();



            HttpWebResponse res = (HttpWebResponse)req.GetResponse();

            //接收NVR返回数据信息

            res = req.GetResponse() as HttpWebResponse;

            //直到req.GetResponse()程序才开始向目标网页发送Post请求

            instream = res.GetResponseStream();

            sr = new StreamReader(instream, encoding);

            //返回结果网页代码

            string content = sr.ReadToEnd();

            Console.Write(content);

            Console.Read();