Vue implements time countdown function

<template>
 <div>Remaining payment time: {{count}}</div>
</template>
<script>
export default {
    data() {
        return {
            count: '', // countdown seconds: 864000 // 10 days of seconds}
    },
    mounted() {
        this.Time() //Call the timer},
    methods: {
        // Day, hour, minute, and second formatting function countDown() {
            let d = parseInt(this.seconds / (24 * 60 * 60))
            d = d < 10 ? "0" + d : d
            let h = parseInt(this.seconds / (60 * 60) % 24);
            h = h < 10 ? "0" + h : h
            let m = parseInt(this.seconds / 60 % 60);
            m = m < 10 ? "0" + m : m
            let s = parseInt(this.seconds % 60);
            s = s < 10 ? "0" + s : s
            this.count = d + 'day' + h + 'hour' + m + 'minute' + s + 'second'
        },
        //The timer parameter is reduced by 1 every 1 second
        Time() {
            setInterval(() => {
                this.seconds -= 1
                this.countDown()
            }, 1000)
        },
    }
}
</script>

countTime: function () {
        //Get the current time var date = new Date();
        var now = date.getTime();
        //Set the deadline var endDate = new Date("2018-10-22 23:23:23");
        var end = endDate.getTime();
        //Time difference var leftTime = end - now;
        //Define variables d, h, m, s to save countdown time if (leftTime >= 0) {
                    d = Math.floor(leftTime / 1000 / 60 / 60 / 24);
                    this.h = Math.floor(leftTime / 1000 / 60 / 60 % 24);
                    this.m = Math.floor(leftTime / 1000 / 60 % 60);
                    this.s = Math.floor(leftTime / 1000 % 60);
         }
          console.log(this.s);
          //Recursively call the countTime method every second to display the dynamic time effect setTimeout(this.countTime, 1000);
 }