Vue中实现多个并行倒计时及路由切换清理方案

data () {
 return {
  list: [ // 准备渲染的数据
   {
    remainTime: 900000, // 距离结束还有多久
    remainTimeStr: '' // 展示文案
   },
   {
    remainTime: 400000,
    remainTimeStr: ''
   },
   {
    remainTime: 60500,
    remainTimeStr: ''
   },
  ]
 }
}

countdowm (timestamp) {
 let self = this
 let timer = setInterval(function () {
  let nowTime = new Date()
  let endTime = new Date(timestamp)
  let t = endTime.getTime() - nowTime.getTime()
  if (t > 0) {
   let day = Math.floor(t / 86400000)
   let hour = Math.floor((t / 3600000) % 24)
   let min = Math.floor((t / 60000) % 60)
   let sec = Math.floor((t / 1000) % 60)
   hour = hour < 10 ? '0' + hour : hour
   min = min < 10 ? '0' + min : min
   sec = sec < 10 ? '0' + sec : sec
   let format = ''
   if (day > 0) {
    format = `${day}天${hour}小时${min}分${sec}秒`
   }
   if (day <= 0 && hour > 0) {
    format = `${hour}小时${min}分${sec}秒`
   }
   if (day <= 0 && hour <= 0) {
    format = `${min}分${sec}秒`
   }
   self.content = format
  } else {
   clearInterval(timer)
   self.content = 'over'
  }
 }, 1000)
}

countdowm (timestamp) {
 let self = this
 let timer = setInterval(function () {
  let t = timestamp
  if (t > 0) {
   let day = Math.floor(t / 86400000)
   let hour = Math.floor((t / 3600000) % 24)
   let min = Math.floor((t / 60000) % 60)
   let sec = Math.floor((t / 1000) % 60)
   day = day < 10 ? '0' + day : day
   hour = hour < 10 ? '0' + hour : hour
   min = min < 10 ? '0' + min : min
   sec = sec < 10 ? '0' + sec : sec
   let format = ''
   format = `${day}天${hour}小时${min}分${sec}秒`
   self.content = format
  } else {
   // clearInterval(timer)
   self.content = 'over'
  }
 }, 1000)
}

countdown () {
 let self = this
 let timer = setInterval(function () {
  for (let i = 0; i < self.list.length; i++) {
   self.list[i].remainTime -= 1000
   let t = self.list[i].remainTime
   if (t > 0) {
    let day = Math.floor(t / 86400000)
    let hour = Math.floor((t / 3600000) % 24)
    let min = Math.floor((t / 60000) % 60)
    let sec = Math.floor((t / 1000) % 60)
    day = day < 10 ? '0' + day : day
    hour = hour < 10 ? '0' + hour : hour
    min = min < 10 ? '0' + min : min
    sec = sec < 10 ? '0' + sec : sec
    let format = ''
    format = `距离结束：<b>${day}</b> 天 <b>${hour}</b> 
时 <b>${min}</b> 分 <b>${sec}</b> 秒`
    self.list[i].remainTimeStr = format
    } else {
    // 进行判断 如果数据内所有的倒计时已经结束，那么结束定时器， 如果没有那么继续执行定时器
    let flag = self.list.every((val, ind) => 
 
val.remainTime <= 0)
    if (flag) clearInterval(timer)
    self.list[i].remainTimeStr = `距离结束：<b>00</b> 天 
<b>00</b> 时 <b>00</b> 分 <b>00</b> 秒` // 结束文案
    }
  }
 }, 1000)
}

destroyed () {
 this.list.forEach((val) => {
  val.remainTime = 0
 })
}