效果如下
<span id="span_dt_dt" style="color:white;background-color:red;font-size:23px">7天9小时29分32秒</span>
<script language="javascript">
<!--
//document.write("");
function show_time(){
window.setTimeout("show_student163_time()", 1000);
BirthDay=new Date("04-01-2015");//改成你的计时日期
today=new Date();
timeold=(BirthDay.getTime()-today.getTime());
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);
seconds=Math.floor((e_minsold-minsold)*60);
if(seconds<10){
seconds="0"+seconds;
}else{
seconds=seconds;
}
span_dt_dt.innerHTML=daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒" ;
}
show_time();
</script>
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