倒计时 天时分秒

		shijian() {
			const EndTIME = new Date(开始时间变量); // 截止时间
			const NowTime = new Date(); // 开始时间
			const usedTime = EndTIME - NowTime; // 相差的毫秒数
			const days = Math.floor(usedTime / (24 * 3600 * 1000)); // 计算出天数
			const leavel = usedTime % (24 * 3600 * 1000); // 计算天数后剩余的时间
			const hours = Math.floor(leavel / (3600 * 1000)); // 计算剩余的小时数
			const leavel2 = leavel % (3600 * 1000); // 计算剩余小时后剩余的毫秒数
			const minutes = Math.floor(leavel2 / (60 * 1000)); // 计算剩余的分钟数
			const leavel3 = leavel2 % (60 * 1000);
			const seconds = Math.round(leavel3 / 1000);
			this.day = days < 10 ? `0${days}` : days;
			this.hour = hours < 10 ? `0${hours}` : hours;
			this.minutes = minutes < 10 ? `0${minutes}` : minutes;
			this.second = seconds < 10 ? `0${seconds}` : seconds;
		},
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				this.shijian();
				setInterval(() => {
					this.shijian();
				}, 1000);
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