时间戳转换yyyy-mm-dd格式

        

function formatTime(dateStr){
  const date = new Date(dateStr)
  const Month = date.getMonth() + 1
  const Day = date.getDate()
  const Y = date.getFullYear() + '-'
  const M = Month < 10 ? '0' + Month + '-' : Month + '-'
  const D = Day + 1 < 10 ? '0' + Day : Day
  return Y + M + D
}