倒计时

<div id="d1" ></div>

<script>

setInterval(function (a,b,c){

var d1 = document.getElementById("d1");

var da = new Date(a,b-1,c).getTime(); //定义时间

var date = new Date().getTime(); //当前时间

var time = Math.floor((da - date)/1000) ; //时间差

var day = Math.floor(time/86400); //天

var h = Math.floor(time%86400/3600); //时

var m = Math.floor(time%3600/60); //分

var s = Math.floor(time%60); //秒

d1.innerHTML = "倒计时："+day+"天"+h+"时"+m+"分"+s+"秒";

}

,1000,2019,12,25); //到某天的倒计时

 

</script>