[精典]JS定时刷新指定页

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　定时刷新指定的页面：<script language="javascript" type="text/javascript">
var timeid = null;
function showtime(){
var now = new Date();
var hours = now.getHours();
var minutes = now.getMinutes();
var seconds = now.getSeconds();
timevalue=" " + ((hours>12)?hours-12:hours);
timevalue += ((minutes<10)?":0":":") + minutes;
timevalue += ((seconds<10)?":0":":") + seconds;
timevalue = ((hours>12)?" 下午:":" 上午:") + timevalue;
mytimer.innerHTML = "<font color=#FFFFFF><nobr>&nbsp;" + timevalue + "&nbsp;</nobr></font>";
//探针，周期 1 分钟
if((minutes % 3 == 0) && (seconds % 59 == 0)){msgalert.location.href = 'index.htm';}
//################################
timeid = setTimeout("showtime()",1000);
}
</script><script type="text/javascript"><!--google_ad_client = "pub-2947489232296736";/* 728x15, 创建于 08-4-23MSDN */google_ad_slot = "3624277373";google_ad_width = 728;google_ad_height = 15;//--></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>

<script type="text/javascript"><!--google_ad_client = "pub-2947489232296736";/* 160x600, 创建于 08-4-23MSDN */google_ad_slot = "4367022601";google_ad_width = 160;google_ad_height = 600;//--></script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>