页面加载进度条

public void Loading()

{

HttpContext hc = HttpContext.Current;

//创建一个页面居中的div

hc.Response.Write("<div id='loading'style='position: absolute; height: 100px; text-align: center;z-index: 9999; left: 50%; top: 50%; margin-top: -50px; margin-left: -175px;'> ");

hc.Response.Write("<br />页面正在加载中，请稍候<br /><br /> ");

hc.Response.Write("<table border='0' cellpadding='0' cellspacing='0' style='background-image: url(images/Progress/plan-bg.gif);text-align: center; width: 300px;'> ");

hc.Response.Write("<tr><td style='height: 20px; text-align: center'><marquee direction='right' scrollamount='30' width='290px'> <img height='10' src='images/Progress/plan-wait.gif' width='270' />");

hc.Response.Write("</marquee></td></tr></table></div>");

//hc.Response.Write("<script>mydiv.innerText = '';</script>");

hc.Response.Write("<script type=text/javascript>");

//最重要是这句了,重写文档的onreadystatechange事件,判断文档是否加载完毕

hc.Response.Write("function document.onreadystatechange()");

hc.Response.Write(@"{ try

{

if (document.readyState == 'complete')

{

delNode('loading');

}

}

catch(e)

{

alert('页面加载失败');

}

}

function delNode(nodeId)

{

try

{

var div =document.getElementById(nodeId);

if(div !==null)

{

div.parentNode.removeChild(div);

div=null;

CollectGarbage();

}

}

catch(e)

{

alert('删除ID为'+nodeId+'的节点出现异常');

}

}

");

hc.Response.Write("</script>");

hc.Response.Flush();

}