Vue the first button click to jump out of the countdown, the second button click to jump out of the fixed data

Vue the first button clicks to jump out of the countdown, and the second button clicks to jump out of the fixed data, but the data that pops out suddenly jumps back to the automatic countdown
clipboard.png

clipboard.png
var app = new Vue ({

el:"-sharpapp",
data:{
        items: [
            {day: "   ", hour: "   ", minute: "   ", second: "   "}
        ]

},

methods: {

    format: function (n) {
        return n < 10 ? "0" + n : n;
    },
    getMyTime: function () {
        var startDate = new Date();
        var endDate = new Date("2018/3/31 11:10:00");
        var countDown = parseInt(endDate.getTime() - startDate.getTime()) / 1000;
        var time1=countDown;
        var day = parseInt(countDown / (24 * 60 * 60));
        var h = parseInt(countDown / (60 * 60) % 24);
        var m = parseInt(countDown / 60 % 60);
        var s = parseInt(countDown % 60);
        this.items[0].day = day;
        this.items[0].hour = this.format(h);
        this.items[0].minute = this.format(m);
        this.items[0].second = this.format(s);
    },
    start: function () {
        var that = this;
        setInterval(function () {
            that.getMyTime();
        }, 1000);
    },
    change:function(){

           Vue.set(this.items,0,{
               day:2,hour:2,minute:2,second:2
           })
        clearInterval(this.items);
    }
}
})
Feb.28,2021

your clearInterval is useless at all

...
start: function () {
        var that = this;
        this.timer = setInterval(function () {
            that.getMyTime();
        }, 1000);
    },
    change:function(){
        clearInterval(this.timer);
           Vue.set(this.items,0,{
               day:2,hour:2,minute:2,second:2
           })
        
    }
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-64f5-1be63b3-46822.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be63b3-46822.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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