成品图：

简单来说就两步，首先把时间转换成常规时间，再定时器让其动起来

首先data里面定个变量showtime,用timeFormate方法转换当前时间，nowTimes动起来

data() {
    return {
      nowTime: "",
    };
  },
  created() {
    this.showTimes();
  },
  methods: {
    // 显示当前时间
    timeFormate(timeStamp) {
      let year = new Date(timeStamp).getFullYear();
      let month =
        new Date(timeStamp).getMonth() + 1 < 10
          ? "0" + (new Date(timeStamp).getMonth() + 1)
          : new Date(timeStamp).getMonth() + 1;
      let date =
        new Date(timeStamp).getDate() < 10
          ? "0" + new Date(timeStamp).getDate()
          : new Date(timeStamp).getDate();
      let hh =
        new Date(timeStamp).getHours() < 10
          ? "0" + new Date(timeStamp).getHours()
          : new Date(timeStamp).getHours();
      let mm =
        new Date(timeStamp).getMinutes() < 10
          ? "0" + new Date(timeStamp).getMinutes()
          : new Date(timeStamp).getMinutes();
      let ss =
        new Date(timeStamp).getSeconds() < 10
          ? "0" + new Date(timeStamp).getSeconds()
          : new Date(timeStamp).getSeconds();
      let week = new Date(timeStamp).getDay();
      let weeks = ["日", "一", "二", "三", "四", "五", "六"];
      let getWeek = "星期" + weeks[week];
      this.nowTime=
        year +
        "年" +
        month +
        "月" +
        date +
        "日" +
        " " +
        hh +
        ":" +
        mm +
        ":" +
        ss +
        getWeek;
    },
    showTimes() {
      this.timeFormate(new Date());
      setInterval(this.showTimes, 1000);
      this.clear();
    },
    clear() {
      clearInterval(this.showTimes);
      this.nowTime= null;
    },
  },