SOURCE

new Vue({
  el:"#app",
  data(){
    return {
      data:{
        test1:'',
        test2:''
			}
		}
  },
  methods:{
    handleClick(){
			setTimeout(_ => {
        const result = {
          test1:'123123',
          test2:'abcabc'
        }
        let data = this.data
        data.test1 = result.test1
        data.test0 = result.test3
        data.test2 = result.test2
      })
    }
  }
})

<div id="app">
  <div>{{data.test1}}</div>
  <div>{{data.test2}}</div>
  <button @click="handleClick">Click Me</button>
</div>
<script src="https://lib.baomitu.com/vue/2.5.17/vue.js"></script>