简单的实现页面倒计时js

简单的实现页面倒计时js

<script>
    function ShowCountDown(year,month,day,hour,minute,second) {
        var now = new Date();
        var endDate = new Date(year,month-1,day,hour,minute,second);
        var leftTime = endDate.getTime() - now.getTime();
        var dd = parseInt(leftTime / 1000 / 60 / 60 / 24, 10);//计算剩余的天数
        var hh = parseInt(leftTime / 1000 / 60 / 60 % 24, 10);//计算剩余的小时数
        var mm = parseInt(leftTime / 1000 / 60 % 60, 10);//计算剩余的分钟数
        var ss = parseInt(leftTime / 1000 % 60, 10);//计算剩余的秒数
        dd = checkTime(dd);
        hh = checkTime(hh);
        mm = checkTime(mm);
        ss = checkTime(ss);
        document.getElementById("s_day").innerHTML = dd;
        document.getElementById("s_time").innerHTML = hh;
        document.getElementById("s_minute").innerHTML = mm;
        document.getElementById("s_second").innerHTML = ss;
    }
    function checkTime(i) {
        if (i < 10) {
            i = "0" + i;
        }
        return i;
    }
    window.setInterval(function () { ShowCountDown(2017,10,10,00,00,00); }, 1000);
</script>