Edit in JSFiddle

var app = new Vue({
    el: '#app',
    data: {
      name: 'Tony',
      phone: '0123456789',
      now: (new Date()).toLocaleTimeString()
    }
  })
  
var timer = setInterval(function(){
  var d = new Date()
  app.now = d.toLocaleTimeString()
}, 1000)
<div id="app">
  Name: {{ name }} <br>
  Phone: {{ phone }} <br>
  Now: {{ now }}
</div>



<script src="https://cdn.jsdelivr.net/vue/2.2.4/vue.js"></script>