js倒计时

 

time=2*60*60;//2小时
var h=Math.floor(time/3600);
var m=Math.floor(time%3600/60);
var s=time%60;

function downTime() {
    var time=2*60*60;
    var spans=document.querySelector(".time").querySelectorAll("span");
    var timer=setInterval(function () {
        time--;
        var h=Math.floor(time/3600);
        var m=Math.floor(time%3600/60);
        var s=time%60

        spans[0].innerHTML=Math.floor(h/10);
        spans[1].innerHTML=h%10;
        spans[3].innerHTML=Math.floor(m/10);
        spans[4].innerHTML=m%10;
        spans[6].innerHTML=Math.floor(s/10);
        spans[7].innerHTML=s%10;
    },1000);
}