对于长时间装载的ASP.NET页面,在客户端浏览器中显示进度

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  Exercise ... {    /**//// <summary>    /// WebForm2 的摘要说明。    /// </summary>    public class WebForm2 : System.Web.UI.Page    ...{        private void Page_Load(object sender, System.EventArgs e)        ...{            // 对于长时间装载的ASP.NET页面如何在客户端浏览器中显示进度？            //对于加载时间比较长的ASP.NET页面，            //我们可以在客户端浏览器中显示进度条来显示页面正在装载。下面就是具体的实现过程：            if(!IsPostBack)            ...{                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();                for(long i=0;i<99999999999;i++) i=i++;                //or Thread.Sleep(10000);            }        }        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.Load += new System.EventHandler(this.Page_Load);        }        #endregion    }} <% ... @ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="Exercise.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  language ="javascript" > ...         HideWait();         </ script >      </ HEAD >      < body  MS_POSITIONING ="GridLayout" >          < form  id ="Form1"  method ="post"  runat ="server" >              &nbsp;          </ form >      </ body > </ HTML >