vue实现电子时钟效果

<div class="dateBox">
      <div class="time">{{ time }}</div>
      <div class="date">{{ date }}</div>
</div>

.dateBox {
  background: #121747;
  background-image: url("~@/assets/images/时间.png");
  background-repeat: no-repeat;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  position: absolute;
  top: 70px;
  right: 50px;
  width: 400px;
  height: 88px;
}

.date {
  font-size: 28px;
  color: #8ac9ff;
  margin-left: 15px;
}

.time {
  font-size: 48px;
  color: #ffffff;
}

data() {
    return {
      date: null,
      time: null,
    };
  },

mounted() {
    const clock = setInterval(() => {
      this.date = getToday().date;
      this.time = getToday().time;
    }, 1000);
    // 通过$once来监听定时器，在beforeDestroy钩子可以被清除。
    this.$once("hook:beforeDestroy", () => {
      clearInterval(clock);
    });
  },

// 日期时间格式化——获取当前日期时间，格式化为 2021/08/30 和 15:35:06
function getToday() {
  var datas = new Date();
  var on1 = "/";
  var on2 = ":";
  var onY = datas.getFullYear(); //年
  var onM = datas.getMonth()   1; //月
  var onD = datas.getDate(); //日
  var onS = datas.getHours(); //时
  var onF = datas.getMinutes(); //分
  var onN = datas.getSeconds(); //秒

  if (onM >= 1 && onM <= 9) {
    //月
    onM = "0"   onM;
  }
  if (onD >= 1 && onD <= 9) {
    //日
    onD = "0"   onD;
  }
  if (onS >= 0 && onS <= 9) {
    //时
    onS = "0"   onS;
  }
  if (onF >= 0 && onF <= 9) {
    //分
    onF = "0"   onF;
  }
  if (onN >= 0 && onN <= 9) {
    //秒
    onN = "0"   onN;
  }

  return {
    date: onY   on1   onM   on1   onD,
    time: onS   on2   onF   on2   onN,
  };
}