SOURCE

var Main = {
    data() {
      return {
        value: '',
        
        list:[
          {ip:''},
          {ip:''},
          {ip:''},
          {ip:''},
        ],
        option:[
          {ip:'1'},
          {ip:'32'},
          {ip:'4'},
          {ip:'5'},
        ]
      };
    },
    mounted() {
    	setTimeout(()=> {
      	this.value = '2018-4-25'
      }, 500)
    }
  };
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.3.6/lib/index.js"></script>
<div id="app">

</div>

@import url("//unpkg.com/element-ui@2.3.6/lib/theme-chalk/index.css");