js模仿微信朋友圈，将时间戳改成刚刚，多少分钟前，多少天前等

时间戳单位需要为毫秒级

let Time = {
//    获取当前时间戳
    getUnix: function () {
      let date = new Date()
      return date.getTime()
    },
//    获取今天0点0分0秒的时间戳
    getTodayUnix: function () {
      let date = new Date()
      date.setHours(0)
      date.setMinutes(0)
      date.setSeconds(0)
      date.setMilliseconds(0)
      return date.getTime()
    },
//    获取今年1月1日0点0分0秒的时间戳
    getYearUnix: function () {
      let date = new Date()
      date.setMonth(0)
      date.setDate(1)
      date.setHours(0)
      date.setMinutes(0)
      date.setSeconds(0)
      date.setMilliseconds(0)
      return date.getTime()
    },
//    获取标准年月
    getLastDate: function (time) {
      let date = new Date(time)
      let month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1
      let day = date.getDate() + 1 < 10 ? '0' + (date.getDate() + 1) : date.getDate() + 1
      return date.getFullYear() + '-' + month + '-' + day
    },
//    转换时间
    getFormatTime: function (timestamp) {
      let now = this.getUnix()
      let today = this.getTodayUnix()
      let year = this.getYearUnix()
      let timer = (now - timestamp) / 1000
      let tip = ''

      if (timer <= 0) {
        tip = '刚刚'
      } else if (Math.floor(timer / 60) <= 0) {
        tip = '刚刚'
      } else if (Math.floor(timer < 3600)) {
        tip = Math.floor(timer / 60) + '分钟前'
      } else if (timer >= 3600 && timer < 86400) {
        tip = Math.floor(timer / 3600) + '小时前'
      } else if (timer / 86400 <= 31) {
        tip = Math.floor(timer / 86400) + '天前'
      } else {
        tip = this.getLastDate(timestamp)
      }
      return tip
    }
  }