代码案例

<script lang="ts" setup>
import { ref,onMounted } from 'vue';
const timer = ref()
const date = ref("")//年月日
const moreTime = ref("")//时分秒
onMounted(()=>{
    //创建定时器1秒执行一次
    timer.value = setInterval(() => {
        formateDate()
    }, 1000)
})
//取消定时器
onBeforeUnmount(() => {
    clearInterval(timer.value) //清除定时器
})
//获取当前时间
const formateDate = () => {
    const time = new Date()
    const year = time.getFullYear()
    const month = complement(time.getMonth() + 1)
    const day = complement(time.getDate())
    const hour = complement(time.getHours())
    const minute = complement(time.getMinutes())
    const second = complement(time.getSeconds())
    moreTime.value = `${hour}:${minute}:${second}`
    date.value = `${year}-${month}-${day}`
}
//当时间为个位数的时候，在数字前加0
const complement = (value: number): string => {
    return value < 10 ? `0${value}` : value.toString()
}
</script>

运行结果