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asp.net WebService+Ajax调用

default.aspx 代码如下：

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

<!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="scripts/jquery-1.7.1.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $("#ajax1").click(function () {
                var data = "{}";
                $.ajax({
                    url: "/WebService.asmx/getmsg",
                    type: "POST",
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    data: data,  
                    success: function (json) {
                        console.info(json.d);
                        alert(json.d);
                    }
                });
            });

            $("#ajax2").click(function () {
                var data = "{'name':'"+$("#name").val()+"'}";
                $.ajax({
                    url: "/WebService.asmx/getname",
                    type: "POST",
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    data: data,
                    success: function (json) {
                        console.info(json.d);
                        alert(json.d);
                    }
                });
            });

            $("#ajax3").click(function () {
                var data = "{'name':'" + $("#name1").val() + "'}";
                $.ajax({
                    url: "/default.aspx/getname",
                    type: "POST",
                    dataType: "json",
                    contentType: "application/json; charset=utf-8",
                    data: data,
                    success: function (json) {
                        console.info(json.d);
                        alert(json.d);
                    }
                });
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input type="button" value="无参"  id="ajax1"/><br/>
        <input type="text" name="name" id="name"/>
        <input type="button" value="带参" id="ajax2" />
        <br />
        <input type="text" name="name" id="name1"/>
        <input type="button"  value="后台方法Ajax调用" id="ajax3"/>
    </div>
    </form>
</body>
</html>

default.aspx.cs 代码如下：

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

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

    }
    [System.Web.Services.WebMethod]
    public static string GetName(string name)
    {
        return "调用后台方法："+name;
    }
}

WebService.cs 代码如下：

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

/// <summary>
/// WebService 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 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 WebService : System.Web.Services.WebService {

    public WebService () {

        //如果使用设计的组件，请取消注释以下行 
        //InitializeComponent(); 
    }

    [WebMethod]
    public string HelloWorld() {
        return "Hello World";
    }
    [WebMethod]
    public string GetMsg()
    {
        return "信息";
    }
    [WebMethod]
    public string GetName(string name)
    {
        return name;
    }
}

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原文地址：https://www.cnblogs.com/shensigzs/p/4246779.html