本文详细介绍了使用AJAX时，Sys.WebForms.PageRequestManager的事件激发顺序，包括initializeRequest、endRequest、beginRequest、pageLoaded和pageLoading等事件，并通过代码示例进行演示。
AJAX 中Sys.WebForms.PageRequestManager的事件激发顺序
测试代码如下:
<%@ Page Language="C#" CodeBehind="Test.aspx.cs" Inherits="AjaxCtpWebDemo.Test" %>
<!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">
<wbr><wbr><wbr> <title>无标题页</title><br> </head><br> <body><br><wbr><wbr><wbr> <form id="form1" runat="server"><br><wbr><wbr><wbr><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <asp:ScriptManager ID="ScriptManager1" runat="server"><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> </asp:ScriptManager><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <%=DateTime.Now.ToString() %><hr/><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <asp:UpdatePanel ID="UpdatePanel1" runat="server"><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <ContentTemplate><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <%=DateTime.Now.ToString() %><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <hr/><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> <asp:Button ID="Button1" runat="server" Text="Button" /><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> </ContentTemplate><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr> </asp:UpdatePanel><br><wbr><wbr><wbr><wbr><wbr><wbr> <script<wbr> type="text/javascript" language="javascript"><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(<br><wbr><wbr><wbr><wbr><wbr> function(sender, e)<br><wbr><wbr><wbr><wbr><wbr> {<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> alert("add_initializeRequest");<wbr><wbr><wbr><br><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr>);<br><wbr><wbr><br><wbr><wbr><br><wbr><wbr>Sys.WebForms.PageRequestManager.getInstance().add_endRequest(<br><wbr><wbr><wbr><wbr><wbr> function(sender,e){<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> alert("add_endRequest");<br><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr>);<br><wbr><wbr><br><wbr><wbr><br><wbr><wbr>Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(<br><wbr><wbr><wbr><wbr><wbr> function(sender,e){<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> alert("add_beginRequest");<br><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr>);<br><wbr><wbr><br><wbr><wbr><br><wbr><wbr>Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(<br><wbr><wbr><wbr><wbr><wbr> function(sender,e){<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> alert("add_pageLoaded");<br><wbr><wbr><wbr><wbr><wbr> }<br><wbr><wbr>);<br><wbr><wbr><br><wbr><wbr>Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(<br><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
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