先將兩個(gè)日期都轉(zhuǎn)為時(shí)間戳，相減后絕對值除以（2436001000）就是天數(shù)

getDays (start, end) { // 2019-01-21，2019-01-23
  let dateSpan, iDays
  start = Date.parse(start)
  end = Date.parse(end)
  dateSpan = end - start
  dateSpan = Math.abs(dateSpan)
  iDays = Math.floor(dateSpan / (24 * 3600 * 1000))
  return iDays;
}

獲取當(dāng)前日期：

var timestamp = new Date().getTime() // 當(dāng)前時(shí)間戳
getDate (timestamp) {
  let date = new Date(timestamp)
  let year = date.getFullYear()
  let month = date.getMonth() + 1
  let day = date.getDate()
  let week = '周' + '日一二三四五六'.charAt(date.getDay())
  if (month < 10) {
    month = '0' + month
  }
  if (day < 10) {
    day = '0' + day
  }
  return year + '-' + month + '-' + day; // 2019-01-21
}