let app = new Vue({
  el: '#app',
  data () {
    return {
      time: '',
      timer: '',
    }
  },
  created () {
    this.time = formatDate()
    this.timer = setInterval(() => {
      this.time = formatDate()
    }, 1000)
  },
  beforeDestroy () {
    if (this.timer) {
      clearInterval(this.timer);
    }
  },
  mounted () {
  },
  methods: {

  },
})