倒计时返回时分秒

function timeCountDown(intDiff, callback) {
    setInterval(function () {
        var day = 0;
        var hour = 0;
        var minute = 0;
        var second = 0;
        if (intDiff > 0) {
            day = Math.floor(intDiff / (60 * 60 * 24));
            hour = Math.floor(intDiff / (60 * 60)) - (day * 24);
            minute = Math.floor(intDiff / 60) - (day * 24 * 60) - (hour * 60);
            second = Math.floor(intDiff) - (day * 24 * 60 * 60) - (hour * 60 * 60) - (minute * 60);
        }
        if (minute <= 9) minute = '0' + minute;
        if (second <= 9) second = '0' + second;
        callback && callback(day, hour, minute, second)
        intDiff--;
    }, 1000);
}