在vue中可以通过给标签加ref属性，就可以在js中利用ref去引用它，从而操作该dom元素，以下是个例子，可以当做参考

<template>
  <div>
    <div id="box" ref="mybox">
        DEMO
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
        invt:''
    }
  },
  mounted () {
    this.init();
  },
  destroyed () {
    clearTimeout(this.invt);
  },
  methods:{
    init() {
      this.$refs.mybox.style.color = 'red';
      this.invt = setTimeout(() => {
        this.$refs.mybox.style.color = 'blue';
      }, 1000)
    }
  }

}
</script>

<style scoped>
  #box {
    width: 100px;
    height: 100px;
    line-height: 100px;
    font-size: 20px;
    text-align: center;
    border: 1px solid black;
    margin: 50px; 
    color: yellow;
  }
</style>