用javascript实现（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>");