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);
