原始ajax方式调用asp.net后台方法

aspx页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Data.aspx.cs" Inherits="Data" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script type="text/javascript">
       //1，jquer方式调用asp.net后台方法
        $(function () {
            $("#getuser").click(function () {
                $.ajax({
                    type:"post",
                    contentType:"application/json;utf-8",
                    datatype:"json",
                    url:"data.aspx/GetUser",
                    data:"{}",
                    success:function(data){
                        var obj=eval("("+data.d+")");
                        alert('姓名:'+obj.name+'年龄：'+obj.age);
                    
                    },
                    error:function(err){
                       alert(err);
                    }
                });
            });
       });

       //2.原始ajax方式调用asp.net后台方法
       //创建xmlHttp对象
       var xmlHttpReq;
       function createXMLHttp() {
          
           if (window.XMLHttpRequest) 
           {
               // code for IE7+, Firefox, Chrome, Opera, Safari
               xmlHttpReq = new XMLHttpRequest();
           }
           else
           {
                //code for IE5， IE6
               xmlHttpReq = new ActiveXObject("Microsoft.XMLHttp");
            }
       }

      
       //创建请求函数
       function ajaxRequest(url) {
           createXMLHttp();
           xmlHttpReq.open('POST', url, false);
           xmlHttpReq.setRequestHeader("Content-type", "application/json");
           xmlHttpReq.onreadystatechange = callBack;
           xmlHttpReq.send(null);
       }

       //创建回调函数
       function callBack() 
       {
           if (xmlHttpReq.readyState == 4) {
               alert(xmlHttpReq.readyState);
               if (xmlHttpReq.status == 200) {
                   var res = xmlHttpReq.responseText;  //res="{"d":"{name:\u0027puter\u0027,age:33}"}" ;
                  var obj=eval("("+res+")");           //obj.d="{name:'puter',age:33}";
                   var user=eval("("+obj.d+")");       //user={name:'puter',age:33}
                   alert("姓名:"+user.name+",年龄："+user.age);

               }
           }
       }
       function send() 
       {
           var url = "Data.aspx/GetUser";
           ajaxRequest(url);
       }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <input type="button" id="getuser" value="获得用户" />
      <input type="button" id="oldajax" value="oldajax" onclick="send()"/>
    </div>
    </form>
</body>
</html>

后台代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Script.Services;
using System.Web.Services;


public partial class Data : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    [WebMethod]
    public static string GetUser()
    {

        return "{name:'puter',age:33}";
        //return "sssssssss";
    }

}

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原文地址：https://www.cnblogs.com/zcttxs/p/2577004.html