vue倒计时

根据两个时间戳计算倒计时

let needDate = endTime -starTime // 计算剩余毫秒值
      var dayDiff = Math.floor(needDate / (24 * 3600 * 1000)) // 计算出相差天数
      var leave1 = needDate % (24 * 3600 * 1000) // 计算天数后剩余的毫秒数
      var dayToHours = dayDiff * 24 // 天数转换成小时
      this.myHours = Math.floor(leave1 / (3600 * 1000)) + dayToHours // 计算出小时数
      // 计算相差分钟数
      var leave2 = leave1 % (3600 * 1000) // 计算小时数后剩余的毫秒数
      this.myMinutes = Math.floor(leave2 / (60 * 1000)) // 计算相差分钟数
      // 计算相差秒数
      var leave3 = leave2 % (60 * 1000) // 计算分钟数后剩余的毫秒数
      this.mySeconds = Math.round(leave3 / 1000)

定时器

let authTimetimer = setInterval(() => {
        this.mySeconds--
        if (this.mySeconds <= -1) {
          this.myMinutes--
          let setTime = 60
          this.mySeconds = setTime
        }
        if (this.myMinutes <= -1) {
          this.myHours--
          let setMimutes = 60
          this.myMinutes = setMimutes
        }
        if (this.myHours <= -1) {
          clearInterval(authTimetimer)
          let overTime = '00'
          this.myMinutes = overTime
          this.mySeconds = overTime
          this.myHours = overTime
          return this.myMinutes && this.mySeconds && this.myHours
        }
      }, 1000)