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页面正在加载的效果

代码文件:

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Threading;
namespace AjaxTest
{
    /**//// <summary>
    /// WebForm2 的摘要说明。
    /// </summary>
    public class WebForm2 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Button Button1;
        protected System.Web.UI.WebControls.Label Label1;
   
        private void Page_Load(object sender, System.EventArgs e)
        {
            Response.Write("<div id=mydiv >");
            Response.Write("_");
            Response.Write("</div>");
            Response.Write("<script>mydiv.innerText = ;</script>");
            Response.Write("<script language=javascript>;");
            Response.Write("var dots = 0;var dotmax = 10;function ShowWait()");
            Response.Write("{var output; output = 正在装载页面;dots++;if(dots>=dotmax)dots=1;");
            Response.Write("for(var x = 0;x < dots;x++){output += ?;}mydiv.innerText =  output;}");
            Response.Write("function StartShowWait(){mydiv.style.visibility = visible; ");
            Response.Write("window.setInterval(ShowWait(),1000);}");
            Response.Write("function HideWait(){mydiv.style.visibility = hidden;");
            Response.Write("window.clearInterval();}");
            Response.Write("StartShowWait();</script>");
            Response.Flush();//这一句是最关键的
        }

        private void Button1_Click(object sender, System.EventArgs e)
        {
            //当点击按钮时,假设请求需要较长时间(这里设置为10秒)
            System.Threading.Thread.Sleep(10000);
            this.Label1.Text = "终于加载完成啦";
        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
       
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {   
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion


    }
}


页面文件:
<%@ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="AjaxTest.WebForm2" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
    <HEAD>
        <title>WebForm2</title>
        <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
        <meta name="CODE_LANGUAGE" Content="C#">
        <meta name="vs_defaultClientScript" content="JavaScript">
        <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
        <script>
         HideWait();
        </script>
    </HEAD>
    <body MS_POSITIONING="GridLayout">
        <form id="Form1" method="post" runat="server">
            <FONT face="宋体">
                <asp:Button id="Button1" style="Z-INDEX: 101; LEFT: 480px; POSITION: absolute; TOP: 200px" runat="server"
                    Text="Button"></asp:Button>
                <asp:Label id="Label1" style="Z-INDEX: 102; LEFT: 632px; POSITION: absolute; TOP: 240px" runat="server">Label</asp:Label></FONT>
        </form>
    </body>
</HTML>