C#实现页面加载(转载收藏学习)
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protected void Page_Load(object sender, EventArgs e)2

{3
Loading();4
}5
public void Loading()6

{7
HttpContext hc = HttpContext.Current;8
//创建一个页面居中的div9
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;'> ");10
hc.Response.Write("<br />页面正在加载中,请稍候<br /><br /> ");11
hc.Response.Write("<table border='0' cellpadding='0' cellspacing='0' style='background-image: url(images/Progress/plan-bg.gif);text-align: center; width: 300px;'> ");12
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' />");13
hc.Response.Write("</marquee></td></tr></table></div>");14
//hc.Response.Write("<script>mydiv.innerText = '';</script>");15
hc.Response.Write("<script type=text/javascript>");16
//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17
hc.Response.Write("function document.onreadystatechange()");18
hc.Response.Write(@"{ try19
{20
if (document.readyState == 'complete')21
{22
delNode('loading');23
}24
}25
catch(e)26
{27
alert('页面加载失败');28
}29
}30
function delNode(nodeId)31
{32
try33
{34
var div =document.getElementById(nodeId);35
if(div !==null)36
{37
div.parentNode.removeChild(div);38
div=null;39
CollectGarbage();40
}41
}42
catch(e)43
{44
alert('删除ID为'+nodeId+'的节点出现异常');45
}46
}47
");48
hc.Response.Write("</script>");49
hc.Response.Flush();50
}51

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