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
 
 1 /**
 2  * Converts the target to a time string in the specified format
 3  * @param {number | string | Date} time Timestamp or time string or Date type
 4  * @param {string} formatStr 'YYYY-MM-DD hh:mm:ss' 'W' ....
 5  * @return {string}
 6  */
 7 function ___formatTime(time, formatStr) {
 8     if (!time) return;
 9     var _time;
10     if (time instanceof Date) {
11         _time = time;
12     } else if (typeof time === 'string' && time.indexOf('-') > -1) {
13         _time = new Date(time.replace(/[\-]/g, '/'));
14     } else {
15         _time = new Date(time);
16     }
17     var date = {
18             year: _time.getFullYear(),
19             month: _time.getMonth() + 1,
20             date: _time.getDate(),
21             day: _time.getDay(),
22             hours: _time.getHours(),
23             minutes: _time.getMinutes(),
24             seconds: _time.getSeconds(),
25             time: _time.getHours() >= 12 ? ["am", "\u4e0a\u5348"] : ["pm", "\u4e0b\u5348"]
26         },
27         reg = {
28             year: /Y+/,
29             date: /D+/,
30             month: /M+/,
31             day: /W/,
32             hours: /h+/i,
33             minutes: /m+/,
34             seconds: /s+/,
35             time: /t/i
36         },
37         dateList = ["\u65e5", "\u4e00", "\u4e8c", "\u4e09", "\u56db", "\u4e94", "\u516d"],
38         k, _p
39     for (k in reg) {
40         _p = reg[k];
41         formatStr = formatStr.replace(_p, function (segment, index, originStr) {
42             var l = segment.length,
43                 value = date[k],
44                 str;
45             switch (k) {
46                 case "day":
47                     str = dateList[value];
48                     break;
49                 case "hours":
50                     str = (segment.toLowerCase() === segment ? value % 12 : value).toString();
51                     break;
52                 case "time":
53                     str = segment.toLowerCase() === segment ? value[0] : value[1]
54                     break;
55             }
56             if (k != "day" && k != "time") {
57                 if (l === 1) {
58                     str = value
59                 } else {
60                     str = ("000" + value).slice(-l);
61                 }
62             }
63             return str;
64         })
65     }
66     return formatStr
67 }
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