[рони]

fori,

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<div id="vue">
    <input type="text" @input="foo" v-model="text">
    <output><output ref="out">
</div>
<script>
var vue = new Vue({
    el: '#vue',
    data: { text : ""
    },
    methods: {
        foo() {
            this.$refs.out.value = this.text;
        }
    },
})
</script>