获取默认的开始时间和结束时间

function getDefaultTime() {

  const date = new Date()

  // 获取开始日期

  const startDate = new Date(date.getTime() - 6 * 24 * 60 * 60 * 1000)

  const startYear = startDate.getFullYear()

  let startMonth = startDate.getMonth() + 1

  startMonth = startMonth <= 9 ? '0' + startMonth : startMonth

  let startDay = startDate.getDate()

  startDay = startDay <= 9 ? '0' + startDay : startDay

  // 结束日期

  const year = date.getFullYear()

  let month = date.getMonth() + 1

  let strDate = date.getDate()

  if (month >= 1 && month <= 9) {

    month = '0' + month

  }

  if (strDate >= 0 && strDate <= 9) {

    strDate = '0' + strDate

  }

  return [startYear + '-' + startMonth + '-' + startDay, year + '-' + month + '-' + strDate]

}