动态设置时间显示：hh:mm、星期、或具体日期

封装共同方法

export function formatMsgTime(time) {
    //time传入的是时间戳，且时间戳长度为10位
    const todayZero = new Date().setHours(0, 0, 0, 0);
    const yearZero = new Date(new Date().getFullYear(), 0, 1, 0, 0, 0, 0).getTime();
    const target = new Date(time * 1000);
    const oneDay = 24 * 60 * 60 * 1000;
    const oneWeek = 7 * oneDay;
    const diff = todayZero - target.getTime();
    const weekdays = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"];
    const weekday = weekdays[target.getDay()];

    function formatNum(num) {
        return num < 10 ? '0' + num : num.toString();
    }
    if (diff <= 0) { // 当天, 
        return `${formatNum(target.getHours())}:${formatNum(target.getMinutes())}`;
    } else if (diff <= oneWeek - oneDay * 4) { // 三天内,根据需求修改需要几天内显示的是星期
        return `${weekday} ${formatNum(target.getHours())}:${formatNum(target.getMinutes())}`;
    } else if (diff > oneWeek - oneDay * 4 && target.getTime() >= yearZero) { // 超过三天且在当年
        return `${target.getMonth() + 1}/${target.getDate()} ${formatNum(target.getHours())}:${formatNum(target.getMinutes())}`;
    } else { //不在当年
        return `${target.getFullYear()}/${target.getMonth() + 1}/${target.getDate()} ${formatNum(target.getHours())}:${formatNum(target.getMinutes())}`;
    }
}

module.exports = {
　　formatMsgTime: formatMsgTime
}