CountDown.vue
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<template>
<span>
{{ lastTime | format }}
</span>
</template>
<script>
function fixedZero(val) {
return val * 1 < 10 ? `0${val}` : val;
}
export default {
name: "CountDown",
props: {
format: {
type: Function,
default: undefined
},
target: {
type: [Date, Number],
required: true,
},
onEnd: {
type: Function,
default: () => {
}
}
},
data() {
return {
dateTime: '0',
originTargetTime: 0,
lastTime: 0,
timer: 0,
interval: 1000
}
},
filters: {
format(time) {
const hours = 60 * 60 * 1000;
const minutes = 60 * 1000;
const h = Math.floor(time / hours);
const m = Math.floor((time - h * hours) / minutes);
const s = Math.floor((time - h * hours - m * minutes) / 1000);
return `${fixedZero(h)}:${fixedZero(m)}:${fixedZero(s)}`
}
},
created() {
this.initTime()
this.tick()
},
methods: {
initTime() {
let lastTime = 0;
let targetTime = 0;
this.originTargetTime = this.target
try {
if (Object.prototype.toString.call(this.target) === '[object Date]') {
targetTime = this.target
} else {
targetTime = new Date(this.target).getTime()
}
} catch (e) {
throw new Error('invalid target prop')
}
lastTime = targetTime - new Date().getTime();
this.lastTime = lastTime < 0 ? 0 : lastTime
},
tick() {
const {onEnd} = this
this.timer = setTimeout(() => {
if (this.lastTime < this.interval) {
clearTimeout(this.timer)
this.lastTime = 0
if (typeof onEnd === 'function') {
onEnd();
}
} else {
this.lastTime -= this.interval
this.tick()
}
}, this.interval)
}
},
beforeUpdate() {
if (this.originTargetTime !== this.target) {
this.initTime()
}
},
beforeDestroy() {
clearTimeout(this.timer)
}
}
</script>
<style scoped>
</style>