JS根据时间戳 或 yyyy-MM-dd HH:mm:ss来获取前天、今天、明天、后天等

摘要：时间戳或由于项目有多个后端人员，难免会出现返回时间样式不统一现象，但前端显示又要统一，先上代码毫秒只需调用此函数判断是否是时间戳昨天今天明天后天昨天今天明天后天时间戳转化成时间格式保证不出现个位数情况

由于项目有多个后端人员，难免会出现返回时间样式不统一现象，但前端显示又要统一，先上代码

// params => "2019-04-02 17:11:55" OR 1554257391000 (毫秒) 只需调用此函数
function formatRecentTime(params) {
  var date = ""
  if (isNaN(params)) { // 判断是否是时间戳
    date = params.toString()
  } else {
    date = timeFormat(params)
  }
  var year = date.substring(0, 4)
  var month = date.substring(5, 7)
  var day = date.substring(8, 10)
  var hour = date.substring(11, 13)
  var minute = date.substring(14, 16)
  var seconds = date.substring(17, 19)
  var orignDate = year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + seconds
  var yesterday = GetDateStr(-1)// 昨天
  var yesterdayStr = yesterday.split("-")
  yesterdayStr[1] = yesterdayStr[1].length === 1 ? "0" + yesterdayStr[1] : yesterdayStr[1]
  yesterdayStr[2] = yesterdayStr[2].length === 1 ? "0" + yesterdayStr[2] : yesterdayStr[2]

  var today = GetDateStr(0)// 今天
  var todayStr = today.split("-")
  todayStr[1] = todayStr[1].length === 1 ? "0" + todayStr[1] : todayStr[1]
  todayStr[2] = todayStr[2].length === 1 ? "0" + todayStr[2] : todayStr[2]

  var tomorrow = GetDateStr(1)// 明天
  var tomorrowStr = tomorrow.split("-")
  tomorrowStr[1] = tomorrowStr[1].length === 1 ? "0" + tomorrowStr[1] : tomorrowStr[1]
  tomorrowStr[2] = tomorrowStr[2].length === 1 ? "0" + tomorrowStr[2] : tomorrowStr[2]

  var afterTomorrow = GetDateStr(2)// 后天
  var afterTomorrowStr = afterTomorrow.split("-")
  afterTomorrowStr[1] = afterTomorrowStr[1].length === 1 ? "0" + afterTomorrowStr[1] : afterTomorrowStr[1]
  afterTomorrowStr[2] = afterTomorrowStr[2].length === 1 ? "0" + afterTomorrowStr[2] : afterTomorrowStr[2]

  if (year === yesterdayStr[0] && month === yesterdayStr[1] && day === yesterdayStr[2]) {
    return "昨天" + " " + hour + ":" + minute
  } else if (year === todayStr[0] && month === todayStr[1] && day === todayStr[2]) {
    return "今天" + " " + hour + ":" + minute
  } else if (year === tomorrowStr[0] && month === tomorrowStr[1] && day === tomorrowStr[2]) {
    return "明天" + " " + hour + ":" + minute
  } else if (year === afterTomorrowStr[0] && month === afterTomorrowStr[1] && day === afterTomorrowStr[2]) {
    return "后天" + " " + hour + ":" + minute
  } else {
    return orignDate
  }
}

// 时间戳转化成时间格式
function timeFormat(timestamp) {
  var time = new Date(timestamp)
  var year = time.getFullYear()
  var month = time.getMonth() + 1
  var date = time.getDate()
  var hours = time.getHours()
  var minutes = time.getMinutes()
  var seconds = time.getSeconds()
  return year + "-" + add0(month) + "-" + add0(date) + " " + add0(hours) + ":" + add0(minutes) + ":" + add0(seconds)
}

// 保证不出现个位数情况
function add0(m) { return m < 10 ? "0" + m : m }

function GetDateStr(AddDayCount) {
  var dd = new Date()
  dd.setDate(dd.getDate() + AddDayCount)
  var y = dd.getFullYear()
  var m = dd.getMonth() + 1
  var d = dd.getDate()
  return y + "-" + m + "-" + d
}