Vue

HTML

<div id="app">
    <div ref="test">{{test}}</div>
    <button @click="handleClick">test</button>
  </div>

CSS

.alert {
  background-color: red;
}

Vue

new Vue({
  el: "#app",
  data: {
    test: 'begin'
  },
  methods: {
        handleClick () {
            this.test = 'end';
            setTimeout(() => {
                console.log(this.$refs.test.innerText);//打印"end"
            });
            console.log(this.$refs.test.innerText);//打印“begin”
        }
    }
})