vue怎么获取DOM节点？

<template>  <div>    <input ref="myInput" type="text" value="hello world">    <button @click="getText">getText</button>  </div></template><script>  export default {    methods: {      getText() {        const input = this.$refs.myInput        console.log(input)        alert(input.value)      }    }  }</script>