164 lines
		
	
	
		
			4.4 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			164 lines
		
	
	
		
			4.4 KiB
		
	
	
	
		
			Vue
		
	
	
	
| <template>
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| 	<view class="u-count-down">
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| 		<slot>
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| 			<text class="u-count-down__text">{{ formattedTime }}</text>
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| 		</slot>
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| 	</view>
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| </template>
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| 
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| <script>
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| 	import props from './props.js';
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| 	import {
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| 		isSameSecond,
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| 		parseFormat,
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| 		parseTimeData
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| 	} from './utils';
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| 	/**
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| 	 * u-count-down 倒计时
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| 	 * @description 该组件一般使用于某个活动的截止时间上,通过数字的变化,给用户明确的时间感受,提示用户进行某一个行为操作。
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| 	 * @tutorial https://uviewui.com/components/countDown.html
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| 	 * @property {String | Number}	time		倒计时时长,单位ms (默认 0 )
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| 	 * @property {String}			format		时间格式,DD-日,HH-时,mm-分,ss-秒,SSS-毫秒  (默认 'HH:mm:ss' )
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| 	 * @property {Boolean}			autoStart	是否自动开始倒计时 (默认 true )
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| 	 * @property {Boolean}			millisecond	是否展示毫秒倒计时 (默认 false )
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| 	 * @event {Function} finish 倒计时结束时触发 
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| 	 * @event {Function} change 倒计时变化时触发 
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| 	 * @event {Function} start	开始倒计时
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| 	 * @event {Function} pause	暂停倒计时 
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| 	 * @event {Function} reset	重设倒计时,若 auto-start 为 true,重设后会自动开始倒计时 
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| 	 * @example <u-count-down :time="time"></u-count-down>
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| 	 */
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| 	export default {
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| 		name: 'u-count-down',
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| 		mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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| 		data() {
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| 			return {
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| 				timer: null,
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| 				// 各单位(天,时,分等)剩余时间
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| 				timeData: parseTimeData(0),
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| 				// 格式化后的时间,如"03:23:21"
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| 				formattedTime: '0',
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| 				// 倒计时是否正在进行中
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| 				runing: false,
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| 				endTime: 0, // 结束的毫秒时间戳
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| 				remainTime: 0, // 剩余的毫秒时间
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| 			}
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| 		},
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| 		watch: {
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| 			time(n) {
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| 				this.reset()
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| 			}
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| 		},
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| 		mounted() {
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| 			this.init()
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| 		},
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| 		methods: {
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| 			init() {
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| 				this.reset()
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| 			},
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| 			// 开始倒计时
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| 			start() {
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| 				if (this.runing) return
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| 				// 标识为进行中
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| 				this.runing = true
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| 				// 结束时间戳 = 此刻时间戳 + 剩余的时间
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| 				this.endTime = Date.now() + this.remainTime
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| 				this.toTick()
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| 			},
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| 			// 根据是否展示毫秒,执行不同操作函数
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| 			toTick() {
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| 				if (this.millisecond) {
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| 					this.microTick()
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| 				} else {
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| 					this.macroTick()
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| 				}
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| 			},
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| 			macroTick() {
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| 				this.clearTimeout()
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| 				// 每隔一定时间,更新一遍定时器的值
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| 				// 同时此定时器的作用也能带来毫秒级的更新
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| 				this.timer = setTimeout(() => {
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| 					// 获取剩余时间
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| 					const remain = this.getRemainTime()
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| 					// 重设剩余时间
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| 					if (!isSameSecond(remain, this.remainTime) || remain === 0) {
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| 						this.setRemainTime(remain)
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| 					}
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| 					// 如果剩余时间不为0,则继续检查更新倒计时
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| 					if (this.remainTime !== 0) {
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| 						this.macroTick()
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| 					}
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| 				}, 30)
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| 			},
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| 			microTick() {
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| 				this.clearTimeout()
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| 				this.timer = setTimeout(() => {
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| 					this.setRemainTime(this.getRemainTime())
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| 					if (this.remainTime !== 0) {
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| 						this.microTick()
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| 					}
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| 				}, 50)
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| 			},
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| 			// 获取剩余的时间
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| 			getRemainTime() {
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| 				// 取最大值,防止出现小于0的剩余时间值
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| 				return Math.max(this.endTime - Date.now(), 0)
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| 			},
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| 			// 设置剩余的时间
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| 			setRemainTime(remain) {
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| 				this.remainTime = remain
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| 				// 根据剩余的毫秒时间,得出该有天,小时,分钟等的值,返回一个对象
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| 				const timeData = parseTimeData(remain)
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| 				this.$emit('change', timeData)
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| 				// 得出格式化后的时间
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| 				this.formattedTime = parseFormat(this.format, timeData)
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| 				// 如果时间已到,停止倒计时
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| 				if (remain <= 0) {
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| 					this.pause()
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| 					this.$emit('finish')
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| 				}
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| 			},
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| 			// 重置倒计时
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| 			reset() {
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| 				this.pause()
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| 				this.remainTime = this.time
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| 				this.setRemainTime(this.remainTime)
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| 				if (this.autoStart) {
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| 					this.start()
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| 				}
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| 			},
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| 			// 暂停倒计时
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| 			pause() {
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| 				this.runing = false;
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| 				this.clearTimeout()
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| 			},
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| 			// 清空定时器
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| 			clearTimeout() {
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| 				clearTimeout(this.timer)
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| 				this.timer = null
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| 			}
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| 		},
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| 		beforeDestroy() {
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| 			this.clearTimeout()
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| 		}
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| 	}
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| </script>
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| 
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| <style
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| 	lang="scss"
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| 	scoped
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| >
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| 	@import "../../libs/css/components.scss";
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| 	$u-count-down-text-color:$u-content-color !default;
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| 	$u-count-down-text-font-size:15px !default;
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| 	$u-count-down-text-line-height:22px !default;
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| 
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| 	.u-count-down {
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| 		&__text {
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| 			color: $u-count-down-text-color;
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| 			font-size: $u-count-down-text-font-size;
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| 			line-height: $u-count-down-text-line-height;
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| 		}
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| 	}
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| </style>
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