秒杀倒计时

<template>
  <span style="color: #ff5454;">{{time}}</span>
</template>

<script>
  export default{
    data () {
      return {
        time : '',
        flag : false,
        timer: null
      }
    },
    mounted () {
      this.timer = setInterval(() => {
          if (this.flag == true) {
               clearInterval(this.timer);
          }
          this.timeDown(endTime);
       }, 1000);
    },
    props : {
      endTime : {
        type : String
      }
    },
    destroyed() {
        // 清除定时器
        clearInterval(this.timer);
    },
    methods : {
      timeDown () {
        const endTime = new Date(this.endTime)
        const nowTime = new Date();
        let leftTime = parseInt((endTime.getTime()-nowTime.getTime())/1000)
        let d = parseInt(leftTime/(24*60*60))
        let h = this.formate(parseInt(leftTime/(60*60)%24))
        let m = this.formate(parseInt(leftTime/60%60))
        let s = this.formate(parseInt(leftTime%60))
        if(leftTime <= 0){
          this.flag = true
        }
        this.time = `${d}天${h}小时${m}分${s}秒`
      },
      formate (time) {
        if(time>=10){
          return time
        }else{
          return `0${time}`
        }
      }
    }
  }
</script>