[转帖] ASP.NET + jQuery异步调用页面后台实例分析

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="JqueryCSMethodForm.aspx.cs" Inherits="JQuerWeb.JqueryCSMethodForm" %>
<!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 type="text/javascript" src="JS/jquery-1.4.2.js"></script>

<script type="text/javascript">
$(document).ready(function() {
   $("input[type='button'][value='GetDate']").click(function() {
         $.ajax({
            type: "post",
            url: "JqueryCSMethodForm.aspx/GetNowDate",
            datatype: "json",
            contentType: "application/json; charset=utf-8",
            success: function(data) {
               $("input#showTime").val(eval('(' + data.d + ')')[0].nowtime);
            },
            error: function(XMLHttpRequest, textStatus, errorThrown) {
               alert(errorThrown);
            }
         });
      });
   $("input[type='button'][value='GetOneDayLater']").click(function() {
      $.ajax({
         type: "post",
         url: "JqueryCSMethodForm.aspx/GetOneDayLate",
         data:"{days:1}",
         datatype: "json",
         contentType: "application/json; charset=utf-8",
         success: function(data) {
            $("input#showTime").val(eval('(' + data.d + ')')[0].nowtime);
         },
         error: function(XMLHttpRequest, textStatus, errorThrown) {
            alert(errorThrown);
         }
     });
   });
});

</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="button" value="GetDate" />
<input type=button value="GetOneDayLater" />
<input type="text" id="showTime" />
</div>
</form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Services;
namespace JQuerWeb
{
public partial class JqueryCSMethodForm : System.Web.UI.Page
{

     protected void Page_Load(object sender, EventArgs e)
   {

   }
   [WebMethod]
   public static String GetNowDate()
   {
         return "[{\"nowtime\":\"" + DateTime.Now.ToShortDateString() + "\"}]";
   }
   [WebMethod]
   public static String GetOneDayLate(Int32 days)
   {
      return "[{\"nowtime\":\"" + DateTime.Now.AddDays(days).ToShortDateString() + "\"}]";
   }
}
}

注意点：

(1) url的填写格式　url+"/method name"

(2) contentType: "application/json; charset=utf-8", 这个必须要有

(3) 返回数据的类型为json

(4) data:"{days:1}",参数的传递

(5) 后台的方法必须是public static 而且还要有 [WebMethod]特性修饰