JS跨域代码片段

js跨域我用的比较多的就是jsonp和程序代理。

但是jsonp只能用get，而且是js异步调用，有时候不能满足项目要求。

下面的代码块是js调用一般处理程序的代理来实现js跨域的。如果js需要多次跨域，推荐下面的方法。 

 

        public string GetInfo(HttpContext context)

        {

            string post = "a=XX&b=XX";

            return CreateHttpRequest("https://www.XXXX.com", post, "POST");

        }

       



        #region 构造请求

        /// <summary>

        /// 构造请求

        /// </summary>

        /// <param name="requestUrl">请求地址</param>

        /// <param name="requestParam">请求参数</param>

        /// <param name="requestMethod">请求方式</param>

        /// <returns></returns>

        public string CreateHttpRequest(string requestUrl, string requestParam, string requestMethod)

        {

            try

            {

                System.Net.HttpWebRequest request = System.Net.HttpWebRequest.Create(requestUrl) as System.Net.HttpWebRequest;

                request.Method = requestMethod;

                string post = requestParam;



                byte[] bytes = System.Text.Encoding.UTF8.GetBytes(post);

                request.ContentType = "application/x-www-form-urlencoded";

                request.ContentLength = bytes.Length;

                System.IO.Stream stream = request.GetRequestStream();

                stream.Write(bytes, 0, bytes.Length);

                System.Net.HttpWebResponse response = request.GetResponse() as System.Net.HttpWebResponse;

                System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream(), System.Text.Encoding.UTF8);

                return sr.ReadToEnd();

            }

            catch (Exception)

            {

                return "";

            }



        }

        #endregion