Ajax跨域请求ashx文件与Webservice文件

前台页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication2.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="jquery-1.7.1.js"></script>
    <script type="text/javascript">
        jQuery(function () {
            jQuery.ajax({
                url: "http://localhost:1203/Handler1.ashx?callback=?",
                //jsonpCallback:callback,
                dataType: "jsonp",
                data: { name: "likong" },
                success: function (result) {
                    window.alert("姓名：" + result.name + "， 性别：" + result.gender);

                }

        })

        function callback(){
            window.alert("回调成功！");

        }

        })
    </script>
</head>
<body>
</body>
</html>

ashx文件代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApplication1
{
    /// <summary>
    /// Handler1 的摘要说明
    /// </summary>
    public class Handler1 : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            string callback = context.Request.QueryString["callback"];
             var name = context.Request.QueryString["name"];
             string json = "{\"name\":\"" + name + "\",\"gender\":\"" + "男" + "\"}";
             //JSONP格式：回调函数名(json格式参数)
             //括号后不要加分号
             string result = callback + "(" + json + ")";
             context.Response.ContentType = "application/json";
             context.Response.Write(result);

        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

前台代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication2.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="jquery-1.7.1.js"></script>
    <script type="text/javascript">
        jQuery(function () {
            jQuery.ajax({
                url: "http://localhost:1203/WebService1.asmx/GetGenderByName?callback=?",
                //jsonpCallback:callback,
                dataType: "jsonp",
                data: { name: "李空" },
                success: function (result) {
                    window.alert("姓名：" + "：" + result.name + "， 性别：" + result.gender);
                }

            });

        function callback(){
            window.alert("回调成功！");

        }

        })
    </script>
</head>
</html>

或者：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication2.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="jquery-1.7.1.js"></script>
    <script type="text/javascript">
        jQuery(function () {
            jQuery.getJSON("http://localhost:1203/WebService1.asmx/GetGenderByName?callback=?&name=李空", function (result) {
                window.alert("姓名：" + "：" + result.name + "， 性别：" + result.gender);
            }, callback())

        function callback(){
            window.alert("回调成功！");

        }

        })
    </script>
</head>
</html>

Webservice代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Serialization;
using System.Data;

namespace WebApplication1
{
    /// <summary>
    /// WebService1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消注释以下行。
     [System.Web.Script.Services.ScriptService]
    public class WebService1 : System.Web.Services.WebService
    {

      [WebMethod]
         public void GetGenderByName(string callback, string name)
         {
             string json = "{\"name\":\"" + name + "\",\"gender\":\"" + "男" + "\"}";
             string result = callback + "(" + json + ")";
             HttpContext.Current.Response.ContentType = "application/json";
             HttpContext.Current.Response.Write(result);
             HttpContext.Current.Response.End();
         }
    }
}

注释：测试Webservice是否调用成功，必须先运行Webservice页面！