JavaScript 日期时间格式化

/**  * 格式化日期  * 例子： dateExtend_Format(new Date(),"yyyy-MM-dd hh:mm:ss SSS")  * @param {Date} targetDate   * @param {String} format   * @returns {string} 返回格式化之后字符串  */ export const dateExtend_Format = function (targetDate, format) {     var year0 = targetDate.getFullYear(),         momth0 = targetDate.getMonth() + 1,         date0 = targetDate.getDate(),         day0 = targetDate.getDay(),         hour0 = targetDate.getHours(),         minute0 = targetDate.getMinutes(),         second0 = targetDate.getSeconds(),         millisecond0 = targetDate.getMilliseconds(),         quarter0 = Math.floor((momth0 + 2) / 3),         numToCnObj = {             0: "日",             1: "一",             2: "二",             3: "三",             4: "四",             5: "五",             6: "六",             7: "七",             8: "八",             9: "九",             10: "十",             11: "十一",             12: "十二",         },         week0 = numToCnObj[day0];      function handleMillisecond(matchLength) {         var retStr = millisecond0.toString().padStart(3, "0");         if (matchLength > 3) {             retStr = retStr.padEnd(matchLength, "0");         } else {             retStr = retStr.substr(0, matchLength);         }         return retStr;     }     var o = {         "y+": function (matchLength) {             // y和yyy都返回1999             var retStr = year0.toString();             if (matchLength === 2) {                 retStr = retStr.substr(-2, 2);             }             else if (matchLength > 4) {                 retStr = retStr.padStart(matchLength, "0");             }             return retStr;         },         "M+": function (matchLength) {             var retStr = momth0.toString();             switch (matchLength) {                 case 1: {                     break;                 }                 case 2: {                     retStr = retStr.padStart(2, "0");                     break;                 }                 case 3: {                     retStr = retStr + "月";                     break;                 }                 default: {                     retStr = numToCnObj[retStr] + "月";                     break;                 }             }             return retStr;         },         "d+": function (matchLength) {             var retStr = date0.toString();             switch (matchLength) {                 case 1: {                     break;                 }                 case 2: {                     retStr = retStr.padStart(2, "0");                     break;                 }                 case 3: {                     retStr = "周" + week0;                     break;                 }                 default: {                     retStr = "星期" + week0;                     break;                 }             }             return retStr;         },         "h+": function (matchLength) {             var retStr = hour0 > 12 ? (hour0 - 12).toString() : hour0.toString();             if (matchLength > 1) {                 retStr = retStr.padStart(2, "0");             }             return retStr;         },         "H+": function (matchLength) {             var retStr = hour0.toString();             if (matchLength > 1) {                 retStr = retStr.padStart(2, "0");             }             return retStr;         },         "m+": function (matchLength) {             var retStr = minute0.toString();             if (matchLength > 1) {                 retStr = retStr.padStart(2, "0");             }             return retStr;         },         "s+": function (matchLength) {             var retStr = second0.toString();             if (matchLength > 1) {                 retStr = retStr.padStart(2, "0");             }             return retStr;         },         "S+": handleMillisecond,         "f+": handleMillisecond,         "t+": function (matchLength) {             var retStr = hour0 > 12 ? "下午" : "上午";             if (matchLength === 1) {                 retStr = retStr.substr(0, matchLength);             }             return retStr;         },         "q+": function (matchLength) {             return quarter0.toString()         },         "w": function (matchLength) {             return week0.toString()         },     }     for (var k in o) {         if (new RegExp("(" + k + ")").test(format)) {             format = format.replace(RegExp.$1, o[k](RegExp.$1.length));         }     }     return format; }

//var date1 = new Date("2021-11-22 15:36:48.678"); var date1 = new Date("2021-01-03 06:07:08.009"); console.log("y->" + dateExtend_Format(date1, "y")); console.log("yy->" + dateExtend_Format(date1, "yy")); console.log("yyy->" + dateExtend_Format(date1, "yyy")); console.log("yyyy->" + dateExtend_Format(date1, "yyyy")); console.log("yyyyy->" + dateExtend_Format(date1, "yyyyy")); console.log("yyyyyy->" + dateExtend_Format(date1, "yyyyyy")); console.log("y-MM-dd->" + dateExtend_Format(date1, "y-MM-dd")); console.log("yy-MM-dd->" + dateExtend_Format(date1, "yy-MM-dd")); console.log("yyy-MM-dd->" + dateExtend_Format(date1, "yyy-MM-dd")); console.log("yyyy-MM-dd->" + dateExtend_Format(date1, "yyyy-MM-dd")); console.log("yyyyy-MM-dd->" + dateExtend_Format(date1, "yyyyy-MM-dd")); console.log("yyyyyy-MM-dd->" + dateExtend_Format(date1, "yyyyyy-MM-dd"));  console.log("M->" + dateExtend_Format(date1, "M")); console.log("MM->" + dateExtend_Format(date1, "MM")); console.log("MMM->" + dateExtend_Format(date1, "MMM")); console.log("MMMM->" + dateExtend_Format(date1, "MMMM")); console.log("MMMMM->" + dateExtend_Format(date1, "MMMMM")); console.log("yyyy-M-dd->" + dateExtend_Format(date1, "yyyy-M-dd")); console.log("yyyy-MM-dd->" + dateExtend_Format(date1, "yyyy-MM-dd")); console.log("yyyy-MMM-dd->" + dateExtend_Format(date1, "yyyy-MMM-dd")); console.log("yyyy-MMMM-dd->" + dateExtend_Format(date1, "yyyy-MMMM-dd")); console.log("yyyy-MMMMM-dd->" + dateExtend_Format(date1, "yyyy-MMMMM-dd"));  console.log("d->" + dateExtend_Format(date1, "d")); console.log("dd->" + dateExtend_Format(date1, "dd")); console.log("ddd->" + dateExtend_Format(date1, "ddd")); console.log("dddd->" + dateExtend_Format(date1, "dddd")); console.log("ddddd->" + dateExtend_Format(date1, "ddddd")); console.log("yyyy-MM-d->" + dateExtend_Format(date1, "yyyy-MM-d")); console.log("yyyy-MM-dd->" + dateExtend_Format(date1, "yyyy-MM-dd")); console.log("yyyy-MM-ddd->" + dateExtend_Format(date1, "yyyy-MM-ddd")); console.log("yyyy-MM-dddd->" + dateExtend_Format(date1, "yyyy-MM-dddd")); console.log("yyyy-MM-ddddd->" + dateExtend_Format(date1, "yyyy-MM-ddddd"));  console.log("h->" + dateExtend_Format(date1, "h")); console.log("hh->" + dateExtend_Format(date1, "hh")); console.log("hhh->" + dateExtend_Format(date1, "hhh")); console.log("hhhh->" + dateExtend_Format(date1, "hhhh")); console.log("h:mm:ss.fff->" + dateExtend_Format(date1, "h:mm:ss.fff")); console.log("hh:mm:ss.fff->" + dateExtend_Format(date1, "hh:mm:ss.fff")); console.log("hhh:mm:ss.fff->" + dateExtend_Format(date1, "hhh:mm:ss.fff")); console.log("hhhh:mm:ss.fff->" + dateExtend_Format(date1, "hhhh:mm:ss.fff"));  console.log("H->" + dateExtend_Format(date1, "H")); console.log("HH->" + dateExtend_Format(date1, "HH")); console.log("HHH->" + dateExtend_Format(date1, "HHH")); console.log("HHHH->" + dateExtend_Format(date1, "HHHH")); console.log("H:mm:ss.fff->" + dateExtend_Format(date1, "H:mm:ss.fff")); console.log("HH:mm:ss.fff->" + dateExtend_Format(date1, "HH:mm:ss.fff")); console.log("HHH:mm:ss.fff->" + dateExtend_Format(date1, "HHH:mm:ss.fff")); console.log("HHHH:mm:ss.fff->" + dateExtend_Format(date1, "HHHH:mm:ss.fff"));  console.log("m->" + dateExtend_Format(date1, "m")); console.log("mm->" + dateExtend_Format(date1, "mm")); console.log("mmm->" + dateExtend_Format(date1, "mmm")); console.log("mmmm->" + dateExtend_Format(date1, "mmmm")); console.log("HH:m:ss.fff->" + dateExtend_Format(date1, "HH:m:ss.fff")); console.log("HH:mm:ss.fff->" + dateExtend_Format(date1, "HH:mm:ss.fff")); console.log("HH:mmm:ss.fff->" + dateExtend_Format(date1, "HH:mmm:ss.fff")); console.log("HH:mmmm:ss.fff->" + dateExtend_Format(date1, "HH:mmmm:ss.fff"));  console.log("s->" + dateExtend_Format(date1, "s")); console.log("ss->" + dateExtend_Format(date1, "ss")); console.log("sss->" + dateExtend_Format(date1, "sss")); console.log("ssss->" + dateExtend_Format(date1, "ssss")); console.log("HH:mm:s.fff->" + dateExtend_Format(date1, "HH:mm:s.fff")); console.log("HH:mm:ss.fff->" + dateExtend_Format(date1, "HH:mm:ss.fff")); console.log("HH:mm:sss.fff->" + dateExtend_Format(date1, "HH:mm:sss.fff")); console.log("HH:mm:ssss.fff->" + dateExtend_Format(date1, "HH:mm:ssss.fff"));  console.log("f->" + dateExtend_Format(date1, "f")); console.log("ff->" + dateExtend_Format(date1, "ff")); console.log("fff->" + dateExtend_Format(date1, "fff")); console.log("ffff->" + dateExtend_Format(date1, "ffff")); console.log("fffff->" + dateExtend_Format(date1, "fffff")); console.log("ffffff->" + dateExtend_Format(date1, "ffffff"));  console.log("HH:mm:ss.f->" + dateExtend_Format(date1, "HH:mm:ss.f")); console.log("HH:mm:ss.ff->" + dateExtend_Format(date1, "HH:mm:ss.ff")); console.log("HH:mm:ss.fff->" + dateExtend_Format(date1, "HH:mm:ss.fff")); console.log("HH:mm:ss.ffff->" + dateExtend_Format(date1, "HH:mm:ss.ffff")); console.log("HH:mm:ss.fffff->" + dateExtend_Format(date1, "HH:mm:ss.fffff")); console.log("HH:mm:ss.ffffff->" + dateExtend_Format(date1, "HH:mm:ss.ffffff"));  console.log("t->" + dateExtend_Format(date1, "t")); console.log("tt->" + dateExtend_Format(date1, "tt")); console.log("ttt->" + dateExtend_Format(date1, "ttt")); console.log("tttt->" + dateExtend_Format(date1, "tttt")); console.log("t HH:mm:ss->" + dateExtend_Format(date1, "t HH:mm:ss")); console.log("tt HH:mm:ss->" + dateExtend_Format(date1, "tt HH:mm:ss")); console.log("ttt HH:mm:ss->" + dateExtend_Format(date1, "ttt HH:mm:ss")); console.log("tttt HH:mm:ss->" + dateExtend_Format(date1, "tttt HH:mm:ss"));