JS跨域代码片段

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