前端工具包之日期格式化

1、时间戳转换年月日时分秒

export function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }

  if ((time + '').length === 10) {
    time = +time * 1000
  }

  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    date = new Date(parseInt(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 timeStr = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    if (key === 'a') {
      return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
    }
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return timeStr
}

2、时间转换多长时间之前 (new Date().valueOf() - 当前时间要减去的时间戳) / 1000 参数

export function formatTime(time, option) {
  time = +time * 1000
  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) {
    // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return (
      d.getMonth() +
      1 +
      '月' +
      d.getDate() +
      '日' +
      d.getHours() +
      '时' +
      d.getMinutes() +
      '分'
    )
  }
}

3、时间格式化年月日

export function getNowFormatDate() {
  var date = new Date()
  var seperator1 = '-'
  var year = date.getFullYear()
  var month = date.getMonth() + 1
  var strDate = date.getDate()
  if (month >= 1 && month <= 9) {
    month = '0' + month
  }
  if (strDate >= 0 && strDate <= 9) {
    strDate = '0' + strDate
  }
  var currentdate = year + seperator1 + month + seperator1 + strDate
  return currentdate
}

4、格式化时间 需要什么格式就传入什么格式

export function formatDate(date, fmt = 'yyyy-MM-dd') {
  if (!(date instanceof Array)) {
    date = new Date(date)
  }
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  const o = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  }
  for (const k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      const str = o[k] + ''
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : padLeftZero(str))
    }
  }
  return fmt
}

function padLeftZero(str) {
  return ('00' + str).substr(str.length)
}