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然后当然要加scriptmanager控件了，如下 <asp:ScriptManager ID="ScriptManager1" runat="server">
<Services>
<asp:ServiceReference Path="~/InboxService.asmx" />
</Services>
</asp:ScriptManager>
这里调用了我们刚才写的webservice
之后是写script了 <script type="text/javascript">
var numberOfEmails_original= 0;
var app = Sys.Application;
app.add_init(applicationInitHandler);
function applicationInitHandler(sender, args) {
InboxService.GetLatestNumberOfEmails(OnCurrentNumberOfEmailsReady);
}
首先，默认的当然是0封邮件了，有变量来存放当前邮件数量，
之后是在ajax中的初始化事件中调用webserice的方法了，并且回调OnCurrentNumberOfEmailsReady方法， function OnCurrentNumberOfEmailsReady(result, userContext, methodName) {
numberOfEmails_original= result;
// Start Checking
StartChecking();
}
OnCurrentNumberOfEmailsReady方法将WEBSERVICE调用的结果（当前状态下有多少封信RESULT）返回给变量，然后调用sartchecking()方法 function StartChecking() {
InboxService.GetLatestNumberOfEmails(OnLastestNumberOfEmailsReady);
}
startchecking方法，继续回调OnLastestNumberOfEmailsReady方法
(编辑:aniston)
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