js 时间处理

时间戳格式化

const formatDate = function (msec, fmt = 'yyyy-MM-dd hh:mm:ss') {
  if (typeof msec !== 'number') {
    return msec
  }
  const date = new Date(parseInt(msec))
  const opt = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  }
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  for (let i in opt) {
    const reg = new RegExp(`(${i})`)
    if (reg.test(fmt)) {
      fmt = fmt.replace(RegExp.$1, RegExp.$1.length === 1 ? opt[i] : opt[i] < 10 ? '0' + opt[i] : opt[i])
    }
  }
  return fmt
}

** 各种时间格式转换时间戳**

const toTimeStamp = function (str) {
  if (typeof str !== 'string') {
    return str
  }
  if (str.length < 6) {
    return str
  }
  let arr = str.split(/[^\d]+/g)
  if (arr.length === 1) {
    arr = [str.substr(0, 4), str.substr(4, 2), str.substr(6, 2)]
  }
  return new Date(arr[0], arr[1] - 1, arr[2] || '1', arr[3] || '0', arr[4] || '0', arr[5] || '0').getTime()
}