1. 时间表示方式

1）标准Date：Mon Nov 11 2010 10:25:12 GMT+0800
2）时间戳：1672047728525
3）字符串：2012-01-11 10:25:12

2. 时间转换及常见方法

// 1. 获取当前时间戳
new Date().getTime() 
Date.now()
// 2.  字符串转标准时间
new Date("2012-01-11 10:25:12")
// 3.  字符串转时间戳
new Date("2012-01-11 10:25:12").getTime()
// 4. 时间戳转字符串
function timestampToTime(timestamp) {  // timestamp为number类型
    var date = new Date(timestamp); //时间戳为10位需*1000，时间戳为13位的话不需乘1000
    var Y = date.getFullYear() + '.';
    var M = ((date.getMonth() + 1) < 10) ? ('0' + (date.getMonth() + 1) + '.') : ((date.getMonth() + 1) + '.');
    var D = (date.getDate() < 10) ? ('0' + date.getDate() + ' ') : (date.getDate() + ' ');
    var h = (date.getHours() < 10) ? ('0' + date.getHours() + ':') : (date.getHours() + ':');
    var m = (date.getMinutes() < 10) ? ('0' + date.getMinutes() + ':') : (date.getMinutes() + ':');
    var s = (date.getSeconds() < 10) ? ('0' + date.getSeconds()) : (date.getSeconds());
    return Y + M + D + h + m + s;
}
// 5. 时间戳转标准时间
new Date(timestamp)
// 6. 标准时间转时间戳
Date.parse(new Date()) //不推荐使用，不准确
new Date().getTime()
(new Date()).valueOf()
// 5. 标准时间转字符串
function getFormatDate (date) {
  let dateNow = new Date()
  if (date) {
    dateNow = date
  }
  const seperator1 = '-', seperator2 = ':'
  let month = dateNow.getMonth() + 1
  month = two_chars(month)
  let strDate = dateNow.getDate()
  strDate = two_chars(strDate)
  let hours = dateNow.getHours()
  hours = two_chars(hours)
  let minute = dateNow.getMinutes()
  minute = two_chars(minute)
  let secs = dateNow.getSeconds()
  secs = two_chars(secs)
  const currentDate = dateNow.getFullYear() + seperator1 + month + seperator1 + strDate + ' ' + hours + seperator2 + minute + seperator2 + secs;
  return currentDate
}
function two_chars(count) {
  if (count >= 1 && count <= 9) {
    count = '0' + count
  }
  return count
}

//7.  获取时间范围，可得到字符串数组
function getDateRange(num) {
  const start = new Date()
  const end = new Date()
  start.setTime(start.getTime() - 3600 * 1000 * 24 * num);
  let a = this.formatDateOrTime(start, '-', true).slice(0, 10)
  let b = this.formatDateOrTime(end, '-', true).slice(0, 10)
  return [a + ' 00:00:00', b + ' 23:59:59']
}
function formatDateOrTime(date, space, isHasTime) {
  const year = date.getFullYear()
  const month = (date.getMonth() + 1) < 10 ? `0${date.getMonth() + 1}` : date.getMonth() + 1
  const day = date.getDate() < 10 ? `0${date.getDate()}` : date.getDate()
  const hour = date.getHours() < 10 ? `0${date.getHours()}` : date.getHours()
  const minutes = date.getMinutes() < 10 ? `0${date.getMinutes()}` : date.getMinutes()
  const seconds = date.getSeconds() < 10 ? `0${date.getSeconds()}` : date.getSeconds()
  let format = ''
  if (!isHasTime) {
    format = year + space + month + space + day
  } else {
    format = year + space + month + space + day + ' ' + hour + ':' + minutes + ':' + seconds
  }
  return format
}

3. 截取URL参数

    GetQueryString(name) {
        if (window.location.hash.split("?").length <= 1) {
            return null;
        }
        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
        var r = window.location.hash.split("?")[1].match(reg);
        if (r != null) return unescape(r[2]);
        return null;
    }

4. 常见正则表达式

// 手机格式判断
function mobile(value) {
    return /^1[23456789]\d{9}$/.test(value)
}
// 电子邮箱
function email(value) {
    return /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/.test(value)
}
// 身份证号
function idCard(value) {
    return /^[1-9]\d{5}[1-9]\d{3}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}([0-9]|X)$/.test(
        value
    )
}

https://www.jianshu.com/p/d073c7ba655d