在網上找了好多，實作方式大多是使用定時器
個人覺得定時器會造成一定程度上的假象
（如：定時器還沒結束頁面已經加載完畢，或定時器結束後頁面還沒加載完成）
本方法利用的是javascript，先網頁面裡面寫入一個層，顯示加載框，然後等頁面結束後
在body的onload中寫入事件，隐藏該對話框
方法（我的系統是多個頁面，是以寫了一個公用的類common.cs）：
在類裡面加入如下函數（也可在每個代碼後檔案中寫入）：
#region "頁面加載中效果"
/// <summary>
/// 頁面加載中效果
/// </summary>
public static void initJavascript()
{
HttpContext.Current.Response.Write(" <script language=JavaScript type=text/javascript>");
HttpContext.Current.Response.Write("var t_id = setInterval(animate,20);");
HttpContext.Current.Response.Write("var pos=0;var dir=2;var len=0;");
HttpContext.Current.Response.Write("function animate(){");
HttpContext.Current.Response.Write("var elem = document.getElementById('progress');");
HttpContext.Current.Response.Write("if(elem != null) {");
HttpContext.Current.Response.Write("if (pos==0) len += dir;");
HttpContext.Current.Response.Write("if (len>32 || pos>79) pos += dir;");
HttpContext.Current.Response.Write("if (pos>79) len -= dir;");
HttpContext.Current.Response.Write(" if (pos>79 && len==0) pos=0;");
HttpContext.Current.Response.Write("elem.style.left = pos;");
HttpContext.Current.Response.Write("elem.style.width = len;");
HttpContext.Current.Response.Write("}}");
HttpContext.Current.Response.Write("function remove_loading() {");
HttpContext.Current.Response.Write(" this.clearInterval(t_id);");
HttpContext.Current.Response.Write("var targelem = document.getElementById('loader_container');");
HttpContext.Current.Response.Write("targelem.style.display='none';");
HttpContext.Current.Response.Write("targelem.style.visibility='hidden';");
HttpContext.Current.Response.Write("}");
HttpContext.Current.Response.Write("</script>");
HttpContext.Current.Response.Write("<style>");
HttpContext.Current.Response.Write("#loader_container {text-align:center; position:absolute; top:40%; width:100%; left: 0;}");
HttpContext.Current.Response.Write("#loader {font-family:Tahoma, Helvetica, sans; font-size:11.5px; color:#000000; background-color:#FFFFFF; padding:10px 0 16px 0; margin:0 auto; display:block; width:130px; border:1px solid #5a667b; text-align:left; z-index:2;}");
HttpContext.Current.Response.Write("#progress {height:5px; font-size:1px; width:1px; position:relative; top:1px; left:0px; background-color:#8894a8;}");
HttpContext.Current.Response.Write("#loader_bg {background-color:#e4e7eb; position:relative; top:8px; left:8px; height:7px; width:113px; font-size:1px;}");
HttpContext.Current.Response.Write("</style>");
HttpContext.Current.Response.Write("<div id=loader_container>");
HttpContext.Current.Response.Write("<div id=loader>");
HttpContext.Current.Response.Write("<div align=center>頁面正在加載中 ...</div>");
HttpContext.Current.Response.Write("<div id=loader_bg><div id=progress> </div></div>");
HttpContext.Current.Response.Write("</div></div>");
HttpContext.Current.Response.Flush();
}
#endregion
}
之後在需要調用的頁面中在Page_Load()時間調用該方法：
Common.initJavascript();
并在每個頁面body加載完畢後調用隐藏該div的事件
<body οnlοad="remove_loading();">
完畢！
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