JS 获取昨天、今天、上一周、本周

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开发日常，没什么技巧，主要是换算，直接看代码；复制粘贴即可用

对应的是element-ui DatePicker 带快捷选项 时间控件，所以返回的是数组；

export const getTime = function () {
  // 起止日期数组
  let dateTime = {
    // 昨天
    yesterday: [],
    // 今天
    today: [],
    // 上一周
    lastWeekDate: [],
    // 本周
    thisWeekDate: []
  }
  // 获取当前时间
  let currentDate = new Date()
  // 返回date是一周中的某一天
  let week = currentDate.getDay()
  // 返回date是一个月中的某一天
  // let month = currentDate.getDate()
  // 一天的毫秒数
  let millisecond = 1000 * 60 * 60 * 24
  // 减去的天数
  let minusDay = week !== 0 ? week - 1 : 6

  // 获得当前周的第一天
  let currentWeekDayOne = new Date(currentDate.getTime() - (millisecond * minusDay))
  // 上周最后一天即本周开始的前一天
  let priorWeekLastDay = new Date(currentWeekDayOne.getTime() - millisecond)
  // 上周的第一天
  let priorWeekFirstDay = new Date(priorWeekLastDay.getTime() - (millisecond * 6))
  // 上周第一天时间封装
  const start = `${priorWeekFirstDay.getFullYear()}-${supplement(priorWeekFirstDay.getMonth() + 1, 2)}-${supplement(priorWeekFirstDay.getDate(), 2)} 00:00:00`
  // 上周最后一天时间封装
  const end = `${priorWeekLastDay.getFullYear()}-${supplement(priorWeekLastDay.getMonth() + 1, 2)}-${supplement(priorWeekLastDay.getDate(), 2)} 23:59:59`

  // 本周 周一
  let monday = new Date(currentDate.getTime() - (minusDay * millisecond))
  // 本周 周日
  let sunday = new Date(monday.getTime() + (6 * millisecond))
  // 本周第一天时间封装
  const start1 = `${monday.getFullYear()}-${supplement(monday.getMonth() + 1, 2)}-${supplement(monday.getDate(), 2)} 00:00:00`
  // 本周最后一天时间封装
  const end2 = `${sunday.getFullYear()}-${supplement(sunday.getMonth() + 1, 2)}-${supplement(sunday.getDate(), 2)} 23:59:59`
  // 添加至上周数组
  dateTime.lastWeekDate.push(start, end)
  // 添加至本周数组
  dateTime.thisWeekDate.push(start1, end2)

  // 昨天
  dateTime.yesterday.push(`${currentDate.getFullYear()}-${supplement(currentDate.getMonth() + 1, 2)}-${supplement(currentDate.getDate() - 1, 2)} 00:00:00`, `${currentDate.getFullYear()}-${supplement(currentDate.getMonth() + 1, 2)}-${supplement(currentDate.getDate() - 1, 2)} 23:59:59`)

  // 今天
  dateTime.today.push(`${currentDate.getFullYear()}-${supplement(currentDate.getMonth() + 1, 2)}-${supplement(currentDate.getDate(), 2)} 00:00:00`, `${currentDate.getFullYear()}-${supplement(currentDate.getMonth() + 1, 2)}-${supplement(currentDate.getDate(), 2)} 23:59:59`)
  return dateTime
}