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离开（关闭）网页前弹出提示
<html>
<head>
<title>破碎锤皮碗</title>
<script language=javascript>
var exittxt="源码爱好者";
function realexit() {
if(exittxt) event.returnValue = http://www.mamicode.com/exittxt
}
</script>
<style>
.time{color:#ffffff;font-family:verdana,geneva,helveticafont-size:9pt}
a:link{text-decoration:none;color:#000000}
a:active{text-decoration:none;color:#000000}
a:visited{text-decoration:none;color:#000000}
a:hover{text-decoration:none;color:#000000}
</style>
<script language="javascript">
var time_now_server,time_now_client,time_end,time_server_client,timerID;
time_end=new Date("Jan 20, 2002 00:00:00");
time_end=time_end.getTime();
time_now_server=new Date("Dec 21, 2001 13:11:1");
time_now_server=time_now_server.getTime();
time_now_client=new Date();
time_now_client=time_now_client.getTime();
time_server_client=time_now_server-time_now_client;
setTimeout("show_time()",1000);
function show_time()
{
timer.innerHTML =time_server_client;
var time_now,time_distance,str_time;
var int_day,int_hour,int_minute,int_second;
var time_now=new Date();
time_now=time_now.getTime()+time_server_client;
time_distance=time_end-time_now;
if(time_distance>0)
{
int_day=Math.floor(time_distance/86400000)
time_distance-=int_day*86400000;
int_hour=Math.floor(time_distance/3600000)
time_distance-=int_hour*3600000;
int_minute=Math.floor(time_distance/60000)
time_distance-=int_minute*60000;
int_second=Math.floor(time_distance/1000)
if(int_hour<10)
int_hour="0"+int_hour;
if(int_minute<10)
int_minute="0"+int_minute;
if(int_second<10)
int_second="0"+int_second;
str_time="<font style=‘font-size:14pt;color:#28C84A‘>"+int_day+"</font><font face=‘黑体‘ style=‘font-size:13pt;‘>天</font><br>"+int_hour+":"+int_minute+":"+int_second;
timer.innerHTML=str_time;
setTimeout("show_time()",1000);
}
else
{
timer.innerHTML ="over";
clearTimeout(timerID)
}
}
</script>
<style>
.time{color:#000000;font-family:verdana;font-size:9pt}
</style>
</head>
<BODY BGCOLOR=#FFFFFF topmargin=2 leftmargin=2 onbeforeunload="realexit()">
<div id="Layer1" style="position:absolute; width:160px; height:187px; z-index:1">
<!-- begin calendar -->
<table width=160 border=0 cellpadding=0 cellspacing=0>
<tr>
<td colspan=3> </td>
</tr>
<tr>
<td width="47"> </td>
<td>
<table width=65 cellpadding=3 cellspacing=0 border=0>
<tr>
<td align=center class="time">
<a href="http://www.mamicode.com/#" target=_blank><div id="timer" style="font-size:9pt;color:red"></div></a>
</td>
</tr>
</table>
</td>
<td width="46"> </td>
</tr>
<tr>
<td colspan=3> </td>
</tr>
</table>
<!-- end calendar -->
</div>
</BODY>
</HTML>