How to set countdown using moment in vue

//Step 1: Introducing momentimport moment from 'moment';

let nowTime:any = ref('')//Current timelet diffTime:any = ref('')//The difference between the current time and the specified timelet countdown:any = ref(0)//Countdown// Set setInterval to output the current time once a second update countdown timelet interval:any = setInterval(function() {
	//Get the current time according to the time, minute and second format. You need to set the year, month and day as follows: "YYYY-MM-DDD HH:mm:ss"	 = moment().format("HH:mm:ss")
	//Get a second value by comparing the time difference	//Compare the time difference. Compare according to the seconds seconds. If it is a year, month and day comparison, set as the right moment('2024-02-05 10:00:00', 'YYY-MMM-DDD hh:mm:ss')	//moment() is the current time	 = moment('10:00:00', 'hh:mm:ss').diff(moment(), "seconds")
	//Countdown If the countdown is only displayed for the last 5 minutes, let's make a judgment	if(<5*60){
		let h = (, 'seconds').hours()//Hour		let m = (, 'seconds').minutes()//minute		let s = (, 'seconds').seconds()//Second		 = `${h<10?'0'+h:h}:${m<10?'0'+m:m}:${s<10?'0'+s:s}`
	}
	// Determine whether the timer needs to be executed	if( < 0 ){
		clearInterval(interval)//Clear the timer	}
}, 1000);


// Triggered when the page is destroyedonBeforeUnmount(()=>{
	clearInterval(interval)//Clear the timer})

countDown(end_time) { 
if (end_time == null) return; 
let nowTime = moment() .locale('zh-cn') .format('YYYY-MM-DD HH:mm:ss'); //Current timelet endTime = moment(end_time) .locale('zh-cn') .format('YYYY-MM-DD HH:mm:ss'); 
return moment(endTime).diff(moment(nowTime), 'seconds'); //The remaining countdown seconds},