vue常用日期和数值精确方法

vue date.js

日期方法

// 当前月第一天
export function getDateDay() {
  var myDate = new Date();
  var tYear = myDate.getFullYear()
  var tMonth = myDate.getMonth()
  tMonth = doHandleZero(tMonth + 1)
  return tYear + "-" + tMonth + "-01"
}
function doHandleZero(zero) {
  var date = zero;
  if (zero.toString().length == 1) {
    date = "0" + zero;
  }
  return date;
}
// 获取当天时间
export function GetDateStrDay(AddDayCount) {
  var dd = new Date()
  dd.setDate(dd.getDate() + AddDayCount) // 获取AddDayCount天后的日期
  var y = dd.getFullYear()
  var m = dd.getMonth() + 1 // 获取当前月份的日期
  var d = dd.getDate()
  if (m < 10) {
    m = '0' + m
  }
  if (d < 10) {
    d = '0' + d
  }
  return y + '-' + m + '-' + d
}
// 年月日
export function formatDate_YMD(time) {
  if (time === '' || time === undefined || time == null) {
    return
  }
  if (time !== '') {
    if (time.toString().substr(6, 13) < 0) {
      return ''
    } else {
      return timeD(new Date(parseInt(time.toString().substr(6, 13))))
    }
  }
}
function timeD(date) {
  var y = date.getFullYear()
  var m = date.getMonth() + 1
  m = m < 10 ? '0' + m : m
  var d = date.getDate()
  d = d < 10 ? '0' + d : d
  return y + '-' + m + '-' + d
}
// 时分秒
export function formatDate_HMS(time) {
  if (time !== '') {
    if (time.toString().substr(6, 13) < 0) {
      return ''
    } else {
      return formatTime(new Date(parseInt(time.toString().substr(6, time.length - 2))))
    }
  }
}
//当前月份
export function getNowMonth() {
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth() + 1;
  month = month > 9 ? month : "0" + month;
  var nowMonth = year + "-" + month;
  return nowMonth;
}
//当前年份
export function getNowYear() {
  var date = new Date();
  var year = date.getFullYear();
  return year;
}
// 周一 至 周日
export function formatTime_Week(date) {
  const nowTime = date.getTime()

  const day = date.getDay() || 7 // 为周日的时候 day 修改为7  否则当天周天会有问题

  const oneDayTime = 24 * 60 * 60 * 1000

  const MondayTime = nowTime - (day - 1) * oneDayTime // 显示周一
  const SundayTime = nowTime + (7 - day) * oneDayTime // 显示周日
  return [new Date(MondayTime), new Date(SundayTime)]
}
//根据身份证获取年龄
export function GetAge(identityCard) {
  let len = (identityCard + "").length;
  let strBirthday = "";
  if (len == 18) {
    //处理18位的身份证号码从号码中得到生日和性别代码
    strBirthday =
      identityCard.substr(6, 4) +
      "/" +
      identityCard.substr(10, 2) +
      "/" +
      identityCard.substr(12, 2);
  }
  if (len == 15) {
    let birthdayValue = "";
    birthdayValue = identityCard.charAt(6) + identityCard.charAt(7);
    if (parseInt(birthdayValue) < 10) {
      strBirthday =
        "20" +
        identityCard.substr(6, 2) +
        "/" +
        identityCard.substr(8, 2) +
        "/" +
        identityCard.substr(10, 2);
    } else {
      strBirthday =
        "19" +
        identityCard.substr(6, 2) +
        "/" +
        identityCard.substr(8, 2) +
        "/" +
        identityCard.substr(10, 2);
    }
  }
  let birthDate = new Date(strBirthday);
  let nowDateTime = new Date();
  let age = nowDateTime.getFullYear() - birthDate.getFullYear();
  //再考虑月、天的因素;.getMonth()获取的是从0开始的，这里进行比较，不需要加1
  if (
    nowDateTime.getMonth() < birthDate.getMonth() ||
    (nowDateTime.getMonth() == birthDate.getMonth() &&
      nowDateTime.getDate() < birthDate.getDate())
  ) {
    age--;
  }
  return age;
}

数值

// 数字格式化
// 保留小数点后两位
export function exTwo(val) {
  return val
    .toString()
    .replace(/^(\-)*(\d+)\.(\d{2}).*$/, '$1$2.$3')
    .replace(/^\./g, '0.')
}
//只允许写入数字后四位
export function ExData(val) {
  return val.toString().replace(/^(\-)*(\d+)\.(\d{4}).*$/, '$1$2.$3')
    .replace(/^\./g, '0.')
    .replace(/-/g, '')
    .replace(/[\u4E00-\u9FA5]|[\uFE30-\uFFA0]/g, '')
    .replace(/[A-Za-z]/g, '')
}
// 保留小数点后四位
export function exFour(val) {
  return val
    .toString()
    .replace(/^(\-)*(\d+)\.(\d{4}).*$/, '$1$2.$3')
    .replace(/^\./g, '0.')
}
// 保留小数点后两位, 四舍五入
export function exTwoRound(val) {
  return (Math.round(val * 100) / 100).toFixed(2)
}
// 这是对两个数乘法的处理 --- 精度
export function accMul(arg1, arg2) {
  var m = 0, s1 = arg1.toString(),
    s2 = arg2.toString();
  try {
    m += s1.split(".")[1].length
  } catch (e) { }
  try {
    m += s2.split(".")[1].length
  } catch (e) { }
  return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m
  )
}