SOURCE

new Vue({
    el: "#app",
    data: {
        msg: "HELLO VUE"
    },
    methods: {
        getDomContent() {
            let dom = document.getElementById("msg")
            let v_dom = this.$refs.msg
            let result = dom === v_dom
            alert('内容：'+ dom.textContent +'对比:' + result)
        }
    }
})

<div id="app">
    <div ref="msg" id="msg">{{ msg }}</div>
    <button @click="getDomContent">get dom content</button>
</div>