html代码(简化)：

<b id="time_b"></b>

js代码:

function ShowCountDown(jztime,divname) { 
    var now = new Date(); 
    var endDate = new Date(Date.parse(jztime.replace(/-/g, "/"))); 
    var leftTime=endDate.getTime()-now.getTime(); 
    var leftsecond = parseInt(leftTime/1000); 
    var day1=Math.floor(leftsecond/(60*60*24)); 
    var hour=Math.floor((leftsecond-day1*24*60*60)/3600); 
    var minute=Math.floor((leftsecond-day1*24*60*60-hour*3600)/60); 
    var second=Math.floor(leftsecond-day1*24*60*60-hour*3600-minute*60);
    if(day1 < 10){day1 = "0"+day1;}
    if(hour < 10){hour = "0"+hour;}
    if(minute < 10){minute = "0"+minute;}
    if(second < 10){second = "0"+second;}
    var cc = document.getElementById(divname); 
    cc.innerHTML = "剩余：<em class='wxmr4'>"+day1+"</em>天<em class='wxml4'>"+hour+"</em>：<em>"+minute+"</em>：<em>"+second+"</em>"; 
} 
window.setInterval(function(){ShowCountDown('<%=engTime%>','time_b');}, 1000);