Vue实现实时刷新时间的功能

 <div class="date">
     {{ time.date }} {{ time.week }} {{ time.time }}
</div> 

<script setup>
import { getTime } from '@/utils';

//获取并刷新日期
const time = ref('');
const getDataTime = () => {
    time.value = getTime();
     setTimeout(getDataTime, 1000);
 };
 onMounted(() => {
    getDataTime();
 });
 </script>

//getTime方法
export function getTime() {
  const nowDate = new Date()
  const date = nowDate.getFullYear() + '-' + _formatNum(nowDate.getMonth() + 1) + '-' + _formatNum(nowDate.getDate())
  const time = _formatNum(nowDate.getHours()) + ':' + _formatNum(nowDate.getMinutes()) + ':' + _formatNum(nowDate.getSeconds())
  let week = ''
  switch (nowDate.getDay()) {
    case 0:
      week = '星期天'
      break
    case 1:
      week = '星期一'
      break
    case 2:
      week = '星期二'
      break
    case 3:
      week = '星期三'
      break
    case 4:
      week = '星期四'
      break
    case 5:
      week = '星期五'
      break
    case 6:
      week = '星期六'
      break
    default:
      break
  }
  return {
    date,
    time,
    week
  }
}

data() {
    return {
      nowDate: null, //存放年月日变量
      nowTime: null, //存放时分秒变量
      timer: "", //定义一个定时器的变量
      currentTime: new Date(), // 获取当前时间
    }
  }

created() 
{
    this.timer = setInterval(this.getTime, 1000);
}

methods: {
    getTime(){
        const date = new Date();
        const year = date.getFullYear();
        const month = date.getMonth() + 1;
        const day = date.getDate();
        const hour= date.getHours();
        const minute = date.getMinutes();
        const second = date.getSeconds();
        const str = ''
        if(this.hour>12) {
            this.hour -= 12;
            this.str = " PM";
        }else{
            this.str = " AM";                        
        }
            this.month=check(month);
            this.day=check(day);
            this.hour=check(hour);
            this.minute=check(minute);
            this.second=check(second);
            function check(i){
                const num = (i<10)?("0"+i) : i;
                return num;
            }
            this.nowDate = year + "年" + this.month + "月" + this.day+"日";
            this.nowTime = this.hour + ":" + this.minute + ":" + this.second + this.str;
        },
}

beforeDestroy() {
    if (this.timer) {
        clearInterval(this.timer); // 在Vue实例销毁前，清除定时器
    }
}