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163 lines
4.4 KiB
163 lines
4.4 KiB
<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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<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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<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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.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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