时间格式化

参数：1.time  a.可以是字符串 '2020-08-20 12:00:00'、'2020/08/20 12:00:00'、'2020/08/20'...   b.也可以是Date类型   c.也可以是时间戳

　　　2.formatStr  需要返回的时间格式  a. 'YYYY-DD-MM hh:mm:ss'、'YYYY-DD-MM'、'hh:mm:ss'... b. "W": week     c.'YYYY年MM月DD日 hh点mm分ss秒'

实例：

console.log(___formatTime(new Date(), 'YYYY年MM月DD日 hh点mm分ss秒')); // 2020年08月20日 11点54分09秒

console.log(___formatTime(new Date().getTime(), 'W')); // 四

console.log(___formatTime('2020-08-20', 'YYYY/MM/DD')) // 2020/08/20

 

/**
 * Converts the target to a time string in the specified format
 * @param {number | string | Date} time Timestamp or time string or Date type
 * @param {string} formatStr 'YYYY-MM-DD hh:mm:ss' 'W' ....
 * @return {string}
 */
function ___formatTime(time, formatStr) {
    if (!time) return;
    var _time;
    if (time instanceof Date) {
        _time = time;
    } else if (typeof time === 'string' && time.indexOf('-') > -1) {
        _time = new Date(time.replace(/[-]/g, '/'));
    } else {
        _time = new Date(time);
    }
    var date = {
            year: _time.getFullYear(),
            month: _time.getMonth() + 1,
            date: _time.getDate(),
            day: _time.getDay(),
            hours: _time.getHours(),
            minutes: _time.getMinutes(),
            seconds: _time.getSeconds(),
            time: _time.getHours() >= 12 ? ["am", "u4e0au5348"] : ["pm", "u4e0bu5348"]
        },
        reg = {
            year: /Y+/,
            date: /D+/,
            month: /M+/,
            day: /W/,
            hours: /h+/i,
            minutes: /m+/,
            seconds: /s+/,
            time: /t/i
        },
        dateList = ["u65e5", "u4e00", "u4e8c", "u4e09", "u56db", "u4e94", "u516d"],
        k, _p
    for (k in reg) {
        _p = reg[k];
        formatStr = formatStr.replace(_p, function (segment, index, originStr) {
            var l = segment.length,
                value = date[k],
                str;
            switch (k) {
                case "day":
                    str = dateList[value];
                    break;
                case "hours":
                    str = (segment.toLowerCase() === segment ? value % 12 : value).toString();
                    break;
                case "time":
                    str = segment.toLowerCase() === segment ? value[0] : value[1]
                    break;
            }
            if (k != "day" && k != "time") {
                if (l === 1) {
                    str = value
                } else {
                    str = ("000" + value).slice(-l);
                }
            }
            return str;
        })
    }
    return formatStr
}