import { VantComponent } from '../common/component'; import { isSameSecond, parseFormat, parseTimeData } from './utils'; function simpleTick(fn) { return setTimeout(fn, 30); } VantComponent({ props: { useSlot: Boolean, millisecond: Boolean, time: { type: Number, observer: 'reset', }, format: { type: String, value: 'HH:mm:ss', }, autoStart: { type: Boolean, value: true, }, }, data: { timeData: parseTimeData(0), formattedTime: '0', }, destroyed() { clearTimeout(this.tid); this.tid = null; }, methods: { // 开始 start() { if (this.counting) { return; } this.counting = true; this.endTime = Date.now() + this.remain; this.tick(); }, // 暂停 pause() { this.counting = false; clearTimeout(this.tid); }, // 重置 reset() { this.pause(); this.remain = this.data.time; this.setRemain(this.remain); if (this.data.autoStart) { this.start(); } }, tick() { if (this.data.millisecond) { this.microTick(); } else { this.macroTick(); } }, microTick() { this.tid = simpleTick(() => { this.setRemain(this.getRemain()); if (this.remain !== 0) { this.microTick(); } }); }, macroTick() { this.tid = simpleTick(() => { const remain = this.getRemain(); if (!isSameSecond(remain, this.remain) || remain === 0) { this.setRemain(remain); } if (this.remain !== 0) { this.macroTick(); } }); }, getRemain() { return Math.max(this.endTime - Date.now(), 0); }, setRemain(remain) { this.remain = remain; const timeData = parseTimeData(remain); if (this.data.useSlot) { this.$emit('change', timeData); } this.setData({ formattedTime: parseFormat(this.data.format, timeData), }); if (remain === 0) { this.pause(); this.$emit('finish'); } }, }, });