Time Format —— 时间格式化

Vue 使用方式

 Vue.filter('timeslot', function (num, fmt = 'hh:mm:ss'): number | string {
    const hours = Math.floor(num / 1000 / 60 / 60);
    const minutes = Math.floor(num / 1000 / 60 - 60 * hours);
    const seconds = Math.floor(num / 1000 - 60 * 60 * hours - 60 * minutes);
    const o = {
        'h+': hours,
        'm+': minutes,
        's+': seconds,
    };
    for (const k in o) {
        if (new RegExp('(' + k + ')').test(fmt)) {
            fmt = fmt.replace(RegExp.$1, RegExp.$1.length === 1 ? o[k] : ('00' + o[k]).substr(('' + o[k]).length));
        }
    }
    return fmt;
});

<div>{{countdown | timeslot('hh', countdown)}}</div>