<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="mytest.aspx.cs" Inherits="CrazyAuchan.mytest" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="Script/core/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(function(){
$("#btnok").click(function(){
show();
});
$("#loading").click(function () {
hide();
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" style="width:200px"/> <br />
<input type="button" id="btnok" value="显示加载" onclick="close();"/>
<div id="loading" style="position:absolute;top:0;left:0;height:100%; width:100%; z-index:999; background:#000 url(loaderc.gif) no-repeat center center; opacity:0.5; filter:alpha(opacity=60);font-size:14px;line-height:20px; display:none;">
<p id="loading-one" style="color:#fff;position:absolute; top:50%; left:50%; margin:20px 0 0 -50px; padding:3px 10px;">
页面加载中...</p>
</div>
<script type="text/javascript">
function show()
{
$("#loading").show();
}
function hide(){
$("#loading").hide();
}
</script>
</div>
</form>
</body>
</html>
原文：http://www.cnblogs.com/itjeff/p/4042966.html