vue计时器（点击按钮1计时，点击按钮2结束计时清除定时器，时间显示格式为：00:00:00）

 html↓

<template>
	<view>
		<button @click="start">开始</button>
		<button @click="end">结束</button>
		{
   
   {nums}}

	</view>
</template>

data↓

data() {
			return {
	
				nums:"00:00:00",
				timer:''
			}
		},

methods↓

		methods: {
			start() {

				var hour, minute, second; /*时 分 秒*/
				hour = minute = second = 0; //初始化
				var millisecond = 0; //毫秒
				this.timer = setInterval(() => {
					millisecond = millisecond + 50;
					// console.log("---millisecond----"+millisecond);
					if (millisecond >= 1000) {
						millisecond = 0;
						second = Number.parseInt(second) + 1;

					}
					if (second >= 60) {
						second = 0;
						minute = Number.parseInt(minute) + 1;
					}

					if (minute >= 60) {
						minute = 0;
						hour = Number.parseInt(hour) + 1;
					}



					// console.log("-------"+hour+'时'+minute+'分'+second+'秒');
					if (hour < 10) {
						hour = Number.parseInt(hour)
						hour = '0' + hour
					}
					if (minute < 10) {
						minute = Number.parseInt(minute)

						minute = '0' + minute
					}
					if (second < 10) {
						second = Number.parseInt(second)
						second = '0' + second
					}
					this.nums = hour + ':' + minute + ':' + second;

				}, 50);
			},
			end() {
				
				clearInterval(this.timer);
				
			}
}