jquery定时ajax调用web service

      jquery：1.3.2
      vs：2008
      最经一直在做moss方面的开发，客户也上了exchange，也做了moss和exchange的sso，但是有新邮件还是要点击进入邮箱才可以查看。客户说要是有新邮件的时候可以提示一下，以为我们以前做过有【每日提醒】，包括每天的日程、文档、邮件，好吧，如果有新的就让【每日提醒】这几个字闪动吧。
      思路就是用ajax定时查看有无新内容，如果有的用一个定时器让文字闪动（通过变化文件的color实现），如果没有就关闭定时器，恢复文字的颜色。这里邮件的获取用到了exchange的web service  http://mail.moss.com/ews/exchange.asmx ，结合jquery和一般处理程序ashx的ajax。
      一般处理程序的代码如下
      

using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.IO;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.Portal.SingleSignon;
using Microsoft.SharePoint.Portal.SingleSignonAdministration;
using System.Net;
using WebApplication1.mtn.gfdx.cds.ucs.mail;
using Microsoft.SharePoint.Portal;
using System.Text;
using System.Text.RegularExpressions;
namespace WebApplication1
{
    /// <summary>
    /// $codebehindclassname$ 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Handler1 : IHttpHandler
    {

        private const string exchangeMailWebRefUrl = @"http://mail.moss.com/ews/exchange.asmx";

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "application/json";
            bool resultjson = false  ;
            resultjson = GetMail();
            string reStr;
            if (resultjson)
                reStr = string.Format("{{contains:'{0}'}}", "true");
            else
                reStr = string.Format("{{contains:'{0}'}}", "false");

            context.Response.Write(reStr);
        }
        
        private void WriteFile(string str)
        {
            try
            {
                File.AppendAllText(@"c:\test.txt", str);
                File.AppendAllText(@"c:\test.txt", Environment.NewLine);
            }
            catch { }
        }
        /// <summary>
        /// 获取是否包含未读Exchange邮件信息
        /// </summary>
        /// <param name="table"></param>
        public bool GetMail()
        {
            bool result = false;
            //DataRow row;
            try
            {
                ICredentials creds = new NetworkCredential("administrator", "123", "moss");
                ExchangeServiceBinding exchangeServer = new ExchangeServiceBinding();
                exchangeServer.Credentials = creds;
                exchangeServer.Url =exchangeMailWebRefUrl 
                exchangeServer.Credentials = creds;
                DistinguishedFolderIdType[] folderIdArray = new DistinguishedFolderIdType[1];
                folderIdArray[0] = new DistinguishedFolderIdType();
                folderIdArray[0].Id = DistinguishedFolderIdNameType.inbox;
                PathToUnindexedFieldType ptuftDisplayName = new PathToUnindexedFieldType();
                ptuftDisplayName.FieldURI = UnindexedFieldURIType.folderDisplayName;
                PathToExtendedFieldType pteftComment = new PathToExtendedFieldType();
                pteftComment.PropertyTag = "0x3004";
                pteftComment.PropertyType = MapiPropertyTypeType.String;
                GetFolderType myFolderType = new GetFolderType();
                myFolderType.FolderIds = folderIdArray;
                myFolderType.FolderShape = new FolderResponseShapeType();
                myFolderType.FolderShape.BaseShape = DefaultShapeNamesType.IdOnly;
                myFolderType.FolderShape.AdditionalProperties = new BasePathToElementType[2];
                myFolderType.FolderShape.AdditionalProperties[0] = ptuftDisplayName;
                myFolderType.FolderShape.AdditionalProperties[1] = pteftComment;
                GetFolderResponseType myFolder = exchangeServer.GetFolder(myFolderType);

                FolderInfoResponseMessageType firmtInbox = (FolderInfoResponseMessageType)myFolder.ResponseMessages.Items[0];
                PathToUnindexedFieldType ptuftSubject = new PathToUnindexedFieldType();
                ptuftSubject.FieldURI = UnindexedFieldURIType.itemSubject;
                PathToUnindexedFieldType ptuftBody = new PathToUnindexedFieldType();
                ptuftBody.FieldURI = UnindexedFieldURIType.itemAttachments;

                PathToExtendedFieldType ppteftFlagStatus = new PathToExtendedFieldType();
                ppteftFlagStatus.PropertyTag = "0x1090";
                ppteftFlagStatus.PropertyType = MapiPropertyTypeType.Integer;

                FindItemType findItemRequest = new FindItemType();
                findItemRequest.Traversal = ItemQueryTraversalType.Shallow;
                findItemRequest.ItemShape = new ItemResponseShapeType();
                findItemRequest.ItemShape.BaseShape = DefaultShapeNamesType.Default;
                findItemRequest.ParentFolderIds = new FolderIdType[1];
                findItemRequest.ParentFolderIds[0] = firmtInbox.Folders[0].FolderId;

                FindItemResponseType firt = exchangeServer.FindItem(findItemRequest);

                MessageType mt = new MessageType();
                //int newMail = 0;
                //int totalMail = 0;
                foreach (FindItemResponseMessageType firmtMessage in firt.ResponseMessages.Items)
                {
                    if (firmtMessage.RootFolder.TotalItemsInView > 0)
                    {
                        foreach (ItemType it in ((ArrayOfRealItemsType)firmtMessage.RootFolder.Item).Items)
                        {

                            mt = it as MessageType;
                            if (mt.IsRead == false)
                            {
                                result = true;
                                break;
                            }
                        }
                    }

                }
            }
            #region
            catch (SingleSignonException ssoex)
            {

            }
            catch (Exception ex)
            {
            }
            #endregion
            return result;
        }

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

      前台的JavaScript代码如下
      

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>

<!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="jquery.js"></script>

    <script type="text/javascript">
        function todayReminderColor() {
            var todayReminder = document.getElementById("todayReminder");
            if (!todayReminder.style.color) {
                todayReminder.style.color = "red";
            }
            if (todayReminder.style.color == "red") {
                todayReminder.style.color = "black";
            } else {
                todayReminder.style.color = "red";
            }
        }
        var timerReminder0 = undefined;
        var timerReminderColor0 = undefined;
        function todayReminder() {
            $.get("Handler1.ashx",
    function(data, textStatus) {
        var color = document.getElementById("todayReminder").style.color;
        if (data == "{contains:'true'}") {
            if (timerReminderColor0 == undefined) {
                timerReminderColor0 = setInterval("todayReminderColor();", 400);
                //alert("New Timer is: " + timerReminderColor0);
            }
            //alert("New Timer is: " + timerReminderColor0);
        } else {
            if (timerReminderColor0 == undefined) {
                //alert("no timerReminderColor0");
            }
            else {
                //alert("Close Timer is: " + timerReminderColor0);
                document.getElementById("todayReminder").style.color = "green";
                clearInterval(timerReminderColor0);
                timerReminderColor0 = undefined;
            }
        }
    });
        }
        $(document).ready(function() {
            timerReminder0 = setInterval("todayReminder()", 2000);
        });
        function stopTimer() {
            if (timerReminder0 == "undefined")
                clearInterval(timerReminder0);
            if (timerReminderColor0 == "undefined")
                clearInterval(todayReminderColor0);
        }

    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
    </div>
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
    <a id="todayReminder" href="#">今日提醒</a>
    </form>
</body>
</html>