<script type="text/javascript">
function show_date_time(end,style,id){
today=new Date();
timeold=((end)*1000-today.getTime());
if (timeold < 0) {
return;
}
setTimeout("show_date_time("+end+','+style+','+id+")", 100);
sectimeold=timeold/1000;
secondsold=Math.floor(sectimeold);
msPerDay=24*60*60*1000;
e_daysold=timeold/msPerDay;
daysold=Math.floor(e_daysold);
e_hrsold=(e_daysold-daysold)*24;
hrsold=Math.floor(e_hrsold);
e_minsold=(e_hrsold-hrsold)*60;
minsold=Math.floor((e_hrsold-hrsold)*60);
e_seconds = (e_minsold-minsold)*60;
seconds=Math.floor((e_minsold-minsold)*60);
ms = e_seconds-seconds;
ms = new String(ms);
ms1 = ms.substr(2,1);
ms2 = ms.substr(2,2);
hrsold1=daysold*24+hrsold;
if(style == 1){
$("#end_date_"+id).html('<em>'+(hrsold1<10?'0'+hrsold1:hrsold1)+"</em>小时<em>"+(minsold<10?'0'+minsold:minsold)+"</em>分<em>"+(seconds<10?'0'+seconds:seconds)+"</em>秒");
}else if(style == 2){
$("#end_date_"+id).html('<em>'+daysold+"</em>天<em>"+(hrsold<10?'0'+hrsold:hrsold)+"</em>时<em>"+(minsold<10?'0'+minsold:minsold)+"</em>分<em>"+(seconds<10?'0'+seconds:seconds)+"</em>秒");
}else if(style == 3){
$("#end_date_"+id).html("<span class='hours'><em>"+(hrsold1<10?'0'+hrsold1:hrsold1)+"</em><i>小时</i></span><span class='minutes'><em>"+(minsold<10?'0'+minsold:minsold)+"</em><i>分</i></span><span class='seconds'><em>"+(seconds<10?'0'+seconds:seconds)+"</em><i>秒</i></span>");
}else{
$("#end_date_"+id).html(daysold+"天"+(hrsold<10?'0'+hrsold:hrsold)+"小 时"+(minsold<10?'0'+minsold:minsold)+"分"+(seconds<10?'0'+seconds:seconds)+"秒."+ms2);
}
}
$(".times").each(function() {
var reg = /^[0-9]+$/;
var times = $(this).attr('data-time');
if (reg.test(times)) {
show_date_time(times, 3, 0);
}
});
</script>
默认是每天 10点 倒计时， 如何修改为 重复4小时倒计时

这一大堆别人一看就眼花了哪还有心情来解答呀