不為別的，只為以後複製貼上方便

data() {
    return {
      date: "",
      time: "",
      week: ""
    };
  },

//vm.timeOffset是與伺服器時間的偏移量，不用的話自行刪掉

methods: {
    //獲取當前時間
    getNowTime: function() {
      let vm = this;
      var nowLocalTime = Date.parse(new Date());
      var nowTime = new Date(nowLocalTime + vm.timeOffset);
      
 
var year = nowTime.getFullYear();
      var mounth =
        nowTime.getMonth() + 1 < 10
          ? "0" + (nowTime.getMonth() + 1)
          : nowTime.getMonth() + 1;
      var date =
        nowTime.getDate() < 10 ? "0" + nowTime.getDate() : nowTime.getDate();
      vm.date = year + "-" + mounth + "-" + date;
      
 
var hour =
        nowTime.getHours() < 10 ? "0" + nowTime.getHours() : nowTime.getHours();
      var minute =
        nowTime.getMinutes() < 10
          ? "0" + nowTime.getMinutes()
          : nowTime.getMinutes();
      vm.time = hour + ":" + minute;
      if (nowTime.getDay() == 0) {
        vm.week 
 
= "星期天";
      } else if (nowTime.getDay() == 1) {
        vm.week = "星期一";
      } else if (nowTime.getDay() == 2) {
        vm.week = "星期二";
      } else if (nowTime.getDay() == 3) {
        vm.week = "星期三";
      } else if (nowTime.getDay() == 4) {
        vm.week = "星期四";
      } else if (nowTime.getDay() == 5) {
        vm.week = "星期五";
      } else if (nowTime.getDay() == 6) {
        vm.week = "星期六";
      }
    }
  },

mounted: function() {
    let vm = this;
    vm.getNowTime();
    vm.currentTimeInterval = setInterval(vm.getNowTime(), 1000);
  }