超简单倒计时代码

<script>
    var starttime = new Date("2018/11/11");
    setInterval(function() {
        var nowtime = new Date();
        var time = starttime - nowtime;
        var day = parseInt(time / 1000 / 60 / 60 / 24);
        var hour = parseInt(time / 1000 / 60 / 60 % 24);
        var minute = parseInt(time / 1000 / 60 % 60);
        var seconds = parseInt(time / 1000 % 60);
        $('.time').html(day + "天" + hour + "时" + minute + "分" + seconds + "秒");
    }, 1200);
</script>