countdownjs.js

function getAdd(time) {
        if (time < 10) {
            return "0" + time;
        } else {
            return time;
        }
    }

    var interval = 1000;
    function ShowCountDown(year, month, day, hourd, minuted) {
        var now = new Date();
        var endDate = new Date(year, month - 1, day, hourd, minuted);
        var leftTime = endDate.getTime() - now.getTime();
        var leftsecond = parseInt(leftTime / 1000);
        var day = Math.floor(leftsecond / (60 * 60 * 24));
        day = day < 0 ? 0 : day;
        var hour = Math.floor((leftsecond - day * 24 * 60 * 60) / 3600);
        hour = hour < 0 ? 0 : hour;
        var minute = Math.floor((leftsecond - day * 24 * 60 * 60 - hour * 3600) / 60);
        minute = minute < 0 ? 0 : minute;
        var second = Math.floor(leftsecond - day * 24 * 60 * 60 - hour * 3600 - minute * 60);
        second = second < 0 ? 0 : second;
        var getDay = getAdd(day);
        var getHour = getAdd(hour);
        var getMinute = getAdd(minute);
        var getSecond = getAdd(second);
        if (document.getElementById("countdown")){
            if (endDate > now) {
                document.getElementById('time').innerHTML = '距离本次活动结束时间还剩下：';
                document.getElementById('day').innerHTML = getDay + '天';
                document.getElementById('hour').innerHTML = getHour + '时';
                document.getElementById('min').innerHTML = getMinute + '分';
                document.getElementById('sec').innerHTML = getSecond + '秒';
            } else {
                document.getElementById('countdown').innerHTML = '本次活动已经结束了哦~'
            }
        }

    }