js计算日期时间距离现在多久

  dateDiff(hisTime, nowTime) {
    if (!arguments.length) return '';
    const arg = arguments
    const  now = arg[1] ? arg[1] : new Date().getTime()
    const  diffValue = now - new Date(arg[0].replace(/-/g, '/')).getTime()
    let   result = ""
    const   minute = 1000 * 60
    const   hour = minute * 60
    const   day = hour * 24
    const   halfamonth = day * 15
    const   month = day * 30
    const   year = month * 12

    const    _year = diffValue / year
    const    _month = diffValue / month
    const    _week = diffValue / (7 * day)
    const   _day = diffValue / day
    const    _hour = diffValue / hour
    const    _min = diffValue / minute
    if (_year >= 1) result = parseInt(_year) + "年前"
    else if (_month >= 1) result = parseInt(_month) + "个月前"
    else if (_week >= 1) result = parseInt(_week) + "周前"
    else if (_day >= 1) result = parseInt(_day) + "天前"
    else if (_hour >= 1) result = parseInt(_hour) + "个小时前"
    else if (_min >= 1) result = parseInt(_min) + "分钟前"
    else result = "刚刚"
    return result
  }