1、时间戳 格式化 为字符串

export const formatDate = function (datetime, str = '-') {
  function add0(m) {
    return m < 10 ? '0' + m : m
  }

  if (!datetime) return
  var date = new Date(datetime);
  var y = date.getFullYear();
  var m = date.getMonth() + 1;
  var d = date.getDate();
  var h = date.getHours();
  var mm = date.getMinutes();
  var s = date.getSeconds();
  return {
    dateTime: y + str + add0(m) + str + add0(d) + ' ' + add0(h) + ':' + add0(mm) + ':' + add0(s), //yyyy-MM-dd hh:mm:ss
    dateTimeMM: y + str + add0(m) + str + add0(d) + ' ' + add0(h) + ':' + add0(mm), //yyyy-MM-dd hh:mm
    dateDay: y + str + add0(m) + str + add0(d), //yyyy-MM-dd
  };
}

2、字符串 格式化 为时间戳

export const formatDateInt = function (timeStr) {
  const dateStr = timeStr.replace(" ", "T")
  const date = new Date(dateStr)
  return date.getTime()
}