!--此节点可允许脚本跨域调用webservice-->

  webServices>
   protocols>
    add name="HttpPost"/>
    add name="HttpGet"/>
   /protocols>
  /webServices>
  !--此节点可允许脚本跨域调用webservice-->

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Mvc;
namespace WebService
{
  /// 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，请取消对下行的注释。
  [System.Web.Script.Services.ScriptService]
  public class WebService1 : System.Web.Services.WebService
  {
    [ValidateInput(false)]
    [WebMethod(Description = "测试")]
    public void getDBTableInfos(string EnterpriseCode)
    {
      HttpContext.Current.Response.ContentType = "application/json;charset=utf-8";
      string jsonCallBackFunName = string.Empty;
      jsonCallBackFunName = HttpContext.Current.Request.Params["jsoncallback"].ToString();
      HttpContext.Current.Response.Write(jsonCallBackFunName + "({ \"Result\": \"" + EnterpriseCode + "\" })");
    } 
  }
} 

!DOCTYPE html>
html>
head>
  title>Index/title>
  script src="http://www.cnblogs.com/Scripts/jquery-1.5.1.js" type="text/javascript">/script>
  script type="text/javascript">
    $(function () {
      $("#btnSubmit").click(function () {
        var EnterpriseCode = "39"; //企业代码        
        var dataStr = "EnterpriseCode=" + EnterpriseCode;
        $.ajax({
          type: "get",
          url: "http://xxx/xxx.asmx/AntiWebQuery_Ajax?jsoncallback?",
          dataType: "jsonp",
          jsonp: 'jsoncallback',
          data: dataStr,
          success: function (result) {
            //返回结果
            alert(result.Result);
          }
        });
      });
    });
  /script>
/head>
body>
  div>
    input id="btnSubmit" type="button" value="查询" />
  /div>
/body>
/html>