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修改响应的请求头，具体修改详见代码：

private void httpPostRequestHandle()
        {
            while (true)
            {
                try
                {
                    //等待请求连接,没有请求则GetContext处于阻塞状态
                    HttpListenerContext requestContext = verifyHttplisten.GetContext();
                    Thread m_threadsub = new Thread(new ParameterizedThreadStart((requestcontext) =>
                    {
                        ResponseEntity<Hashtable> result = new ResponseEntity<Hashtable>();
                        //客户端发送过来的信息
                        HttpListenerContext request = (HttpListenerContext)requestcontext;
                        //获取HTTPRequest的帮助类
                        HttpListenerHelper httppost = new HttpListenerHelper(request);
                        try
                        {
                            lock (listenLocker)
                            {
                                result.Message = "No such method";
                                switch (request.Request.HttpMethod)
                                {
                                    case "GET":
                                        if (request.Request.RawUrl == "/api/v1/idcard/last")
                                        {
                                            result.Code = 0;
                                            result.Message = "读卡成功";
                                            result.Data = cardinfo;
                                        }
                                        break;
                                }
                            }
                        }
                        catch (Exception ex)
                        {
                            result.Message = ex.Message;
                            LogHelper.CreateErrorLogTxt("verifyhttplistern", ex.Source.ToString(), ex.Message);
                        }
                        //Response  
                        request.Response.StatusCode = 200;
                        //添加如下的响应的请求头，即可解决跨域问题
                        request.Response.Headers.Add("Access-Control-Allow-Origin", "*");
                        request.Response.Headers.Add("Access-Control-Allow-Headers", "*");  
                        request.Response.Headers.Add("Access-Control-Allow-Methods", "GET,POST");
                        request.Response.ContentType = "application/json";
                        request.Response.ContentEncoding = Encoding.UTF8;
                      
                        byte[] buffer = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(result));
                        request.Response.ContentLength64 = buffer.Length;
                        var output = request.Response.OutputStream;
                        output.Write(buffer, 0, buffer.Length);
                        output.Close();
                    }));
                    m_threadsub.IsBackground = true;
                    m_threadsub.Start(requestContext);
                }
                catch (Exception ex)
                {
                    LogHelper.CreateErrorLogTxt("httpRequestHandle", ex.Source, ex.Message);
                }
            }
        }