如何在uniapp中实现倒计时和闹钟功能

<template>
    <div>{{ countDown }}</div>
</template>

<script>
    export default {
        data() {
            return {
                countDown: 60, // 倒计时时长
                timer: null // 计时器对象
            }
        },
        mounted() {
            this.startCountdown()
        },
        methods: {
            startCountdown() {
                this.timer = setInterval(() => {
                    if (this.countDown > 0) {
                        this.countDown--
                    } else {
                        clearInterval(this.timer)
                        this.timer = null
                    }
                }, 1000)
            },
            stopCountdown() {
                clearInterval(this.timer)
                this.timer = null
            }
        }
    }
</script>

<template>
    <div>
        <countdown></countdown>
        <button @click="stopCountdown">停止倒计时</button>
    </div>
</template>

<script>
    import Countdown from '@/components/Countdown.vue'

    export default {
        components: {
            Countdown
        },
        methods: {
            stopCountdown() {
                this.$refs.countdown.stopCountdown()
            }
        }
    }
</script>

<template>
    <div>{{ currentTime }}</div>
</template>

<script>
    export default {
        data() {
            return {
                currentTime: '', // 当前时间
                timer: null // 计时器对象
            }
        },
        mounted() {
            this.startAlarmClock()
        },
        methods: {
            startAlarmClock() {
                this.timer = setInterval(() => {
                    const now = new Date();
                    const hours = now.getHours();
                    const minutes = now.getMinutes();
                    const seconds = now.getSeconds();
                    this.currentTime = `${hours}:${minutes}:${seconds}`;
                }, 1000)
            },
            stopAlarmClock() {
                clearInterval(this.timer)
                this.timer = null
            }
        }
    }
</script>

<template>
    <div>
        <alarm-clock></alarm-clock>
        <button @click="stopAlarmClock">停止闹钟</button>
    </div>
</template>

<script>
    import AlarmClock from '@/components/AlarmClock.vue'

    export default {
        components: {
            AlarmClock
        },
        methods: {
            stopAlarmClock() {
                this.$refs.alarmClock.stopAlarmClock()
            }
        }
    }
</script>