vue如何动态获取当前时间

<template>
  <div id="home">
    <span class="deadline">截止{{ gettime }}</span>
  </div>
</template>
 
<script>
export default {
  name: "Home",
  data() {
    return {
      gettime: "", //当前时间
    };
  },
 
  methods: {
    getTime() {
    var _this = this;
      let yy = new Date().getFullYear();
      var mm =
        new Date().getMonth() > 9
          ? new Date().getMonth() + 1
          : new Date().getMonth() == 9
          ? new Date().getMonth() + 1
          : '0' + (new Date().getMonth() + 1);
      var dd = new Date().getDate() < 10 ? '0' + new Date().getDate() : new Date().getDate();
      let hh = new Date().getHours();
      let mf =
        new Date().getMinutes() < 10 ? '0' + new Date().getMinutes() : new Date().getMinutes();
      let ss =
        new Date().getSeconds() < 10 ? '0' + new Date().getSeconds() : new Date().getSeconds();
      _this.gettime = yy + '-' + mm + '-' + dd + ' ' + hh + ':' + mf + ':' + ss;
    },
    currentTime() {
      setInterval(this.getTime, 1000);
    },
   
  },
  mounted() {
    this.currentTime();
  },
};
</script>
 
<style scoped>
</style>​

<template>
  <div id="home">
    <span class="deadline">当前日期{{ sendTime }}</span>
  </div>
</template>
 
<script>
export default {
  name: "Home",
  data() {
    return {
      sendTime: "", //当前时间
    };
  },
  mounted() {
    this.format();
  },
  methods: {
      format() {
                    const nowDate = new Date();
                    const date = {
                        year: nowDate.getFullYear(),
                        month: nowDate.getMonth() + 1,
                        date: nowDate.getDate(),
                    }
                    const newmonth = date.month > 9 ? date.month : '0' + date.month
                    const day = date.date > 9 ? date.date : '0' + date.date
                    this.sendTime = date.year + '.' + newmonth + '.' + day
 
                }, //获取当前时间
   
  },
};
</script>
 
<style scoped>
</style>

<div><span>{{nowDate}}</span><span class="houertime">{{hourDate}}</span></div>

data(){
    return {
          nowDate: null,
          hourDate: null,
          nowtimer: ''
    }
},

created() {
    this.gettime()  // 如果不先调用一次的话，页面显示一秒后，时间才会显示
    this.nowtimer = setInterval(this.gettime, 1000);
  },
 methods: {
    gettime() {
        this.nowDate = new Date().toLocaleString('zh', { year: 'numeric', month: 'numeric', day: 'numeric' })
        this.hourDate = new Date().toLocaleString('zh', { hour: 'numeric', minute: 'numeric', second: 'numeric' })
    }
  },

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