<script type="text/javascript" >
window.onload = function(){
var now;
var t;
iNow(2017,2,8,14,03,0); //传入截止时间(年/月/日 时/分/秒)
contrary();
function iNow(year,month,day,h,m,s){
now = new Date(year,month,day,h,m,s);
}
function contrary(){
var iNew = new Date(); //系统当前时间
var t = Math.floor((now - iNew)/1000); //得到相差时间单位/S
str = Math.floor(t/86400) +'天'+ Math.floor(t%86400/3600) +'时'+ Math.floor(t%86400%3600/60) +'分'+ Math.floor(t%60) + '秒';
document.body.innerHTML = str;
}
setInterval(contrary,1000);
}
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