1 <div id="app">
 2     <div ref="box">你好！</div>
 3     <button @click="my_click">点我获取上面的标签</button>
 4 </div>
 5 <script>
 6     const app = new Vue({
 7         el:'#app',
 8         methods:{
 9             my_click(){
10                 // 获取ref='box'的div标签
11                 let ele = this.$refs.box;
12                 console.log(ele);
13                 // 改变该标签的文本
14                 ele.innerText = '我不好！';
15             }
16         }
17     })
18 </script>