1. dateUtile.js 代码

const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']const timeToEng = function(time) {const date = new Date(time)return months[date.getMonth()]
}
// 输入time为时间戳,add表示加减天数, 默认为0
const timeFormat = function(time, fmt, add=0) {if (time === undefined || time === null) {return '无'}var date = new Date()date.setTime(new Date(Number(time)).getTime() + 1000*60*60*24*add)var o = {'M+': date.getMonth() + 1, // 月份'd+': date.getDate(), // 日'h+': date.getHours(), // 小时'm+': date.getMinutes(), // 分's+': date.getSeconds(), // 秒'q+': Math.floor((date.getMonth() + 3) / 3), // 季度'S': date.getMilliseconds() // 毫秒}if (/(y+)/.test(fmt)) { fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length)) }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
}// 获取当月开始结束日期 cch
const getCurrentMonthDay = () => {const now = new Date()const yindex = now.getFullYear() - 1990const mindex = now.getMonth()const day = now.getDate() - 1return [[yindex,mindex,0],[yindex,mindex,day]]
}
// 当前日期
const parseTime = function parseTime(time, cFormat) {const format = cFormat || 'y/m/d h:i:s'let dateif (typeof time === 'object') {date = time} else {if (('' + time).length === 10) time = parseInt(time) * 1000date = new Date(time)}const formatObj = {y: date.getFullYear(),m: date.getMonth() + 1,d: date.getDate(),h: date.getHours(),i: date.getMinutes(),s: date.getSeconds(),a: date.getDay()}const time_str = format.replace(/(y|m|d|h|i|s|a)+/g, (result, key) => {let value = formatObj[key]// Note: getDay() returns 0 on Sundayif (key === 'a') {return ['日', '一', '二', '三', '四', '五', '六'][value]}if (result.length > 0 && value < 10) {value = '0' + value}return value || 0})return time_str
}
// 获取现在日期指定多少天前
const getBeforeDate = function getBeforeDate(n) {var n = n;var d = new Date();var year = d.getFullYear();var mon = d.getMonth() + 1;var day = d.getDate();if(day <= n) {if(mon > 1) {mon = mon - 1;} else {year = year - 1;mon = 12;}}d.setDate(d.getDate() - n);year = d.getFullYear();mon = d.getMonth() + 1;day = d.getDate();return year + "-" + (mon < 10 ? ('0' + mon) : mon) + "-" + (day < 10 ? ('0' + day) : day);
}const dateDiff = function dateDiff(sDate1, sDate2) {     //sDate1和sDate2是"2002-12-18"格式var aDate, oDate1, oDate2, iDays;aDate = sDate1.split("-");oDate1 = new Date(aDate[0], aDate[1] - 1, aDate[2]);aDate = sDate2.split("-");oDate2 = new Date(aDate[0], aDate[1] - 1, aDate[2]);iDays = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 / 24);if((oDate1 - oDate2) < 0) {return -iDays;}return iDays;
}export { timeToEng, timeFormat,getCurrentMonthDay, parseTime, getBeforeDate, dateDiff  }

2. 使用

import { timeFormat } from "@/utils/dateUtils.js";timeFormat(new Date(), "yyyy-MM-dd");// 2022-2-12
timeFormat(Date.now(), "yyyyMMdd") + Date.now();// 2022212