Vue-countdown countdown cannot set time dynamically

vue-countdown is used in the project to implement the countdown. The remaining time of the countdown is obtained from api, but the countdown displayed on the page does not change automatically. The code is as follows:

<vue-countdown :time="countDown" :interval="1000" :auto-start="true" ref="countdown" class="count-down">
    <template slot-scope="props">{{ props.days }}{{ props.hours }}{{ props.minutes }}{{ props.seconds }}</template>
</vue-countdown>

<script>
import VueCountdown from "@xkeshi/vue-countdown"
export default {
    components: {
        VueCountdown
    },
    data () {
        return {
            countDown: 0
        }
    },
    created: function () {
        axios({
            method: "GET",
            url: "http://a.b.c",
            withCredentials: true,
            headers: {"lang": "zh", "token": "", "os": "web", "version": "1.0.0", "time": ""}
        }).then((response) => {
            let responseData = response.data.data
            this.timeLeft = responseData.timeLeft
            let now = new Date()
            let timer = (this.timeLeft + 0) * 1000
            let setNow = new Date(now.getTime() + timer)
            this.countDown = setNow - now
            this.$refs.countdown.init()
            this.$refs.countdown.start()
        }).catch((ex) => {
            console.log(ex)
        })
    }
}
</script>

the remaining time can be displayed in the page written in this way, but the time will not change by itself. In the above code, if you directly write the value of countDown in return and comment out the countDown assignment in the hook function, the countdown is no problem, and the official document has not found a description of this. I feel that I have something wrong with my operation and ask the boss for advice

.
Jun.08,2021

auto-start change to false to try

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b30303-2b540.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30303-2b540.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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