博客

1.一般用于活动的倒计时

1.先定义一个方法：
set_countDown() {
				let now = new Date();
				let datatime = this.datas.end_time.replace(/\-/g, '/'); // replace + 正则 匹配替换  / 斜杠
				let endDate = new Date(datatime);
				let leftTime = endDate.getTime() - now.getTime(); //计算剩余的毫秒数
				if (leftTime <= 0) {
					leftTime = 0;
				}
				let leftsecond = parseInt(leftTime / 1000); //计算剩余的秒数
				let day = Math.floor(leftsecond / (60 * 60 * 24));
				let hour = Math.floor((leftsecond - day * 24 * 60 * 60) / 3600);
				let minute = Math.floor((leftsecond - day * 24 * 60 * 60 - hour * 3600) / 60);
				let second = Math.floor(leftTime / 1000 % 60, 10);
				hour = hour < 10 ? '0' + hour : hour
				minute = minute < 10 ? '0' + minute : minute
				second = second < 10 ? '0' + second : second
				this.time = {
					day: day,
					hour: hour,
					minute: minute,
					second: second
				}
			},

2.从后台服务器拿到结束时间：

	get_datas() {
				var that = this
				uni.$u.http.get('接口').then(res => {
					that.datas = res.data
				}).catch(err => {
			
				})
			},

3.在onshow  或者在  onlode中使用定时器一秒执行一次

onShow() {
			setInterval(() => {
				this.set_countDown()
			}, 1000)
		},