秒数转成时分秒格式

formatDuring (seconds) {
            let sec = seconds % 60;
            let hours = Math.floor(seconds / 3600);
            let minutes = Math.floor((seconds - hours * 3600) / 60);

            sec = sec < 10 ? '0' + sec : sec;
            minutes = minutes < 10 ? '0' + minutes : minutes;
            hours = hours < 10 ? '0' + hours : hours;

            return hours + ":" + minutes + ":" + sec;
        },