<div id="app"> <input v-model="value" type="text" @input="input"> <p v-text="msg"></p></div><script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>xxxxxxxxxxinput{ font-size:16px; height:30px; padding:0 15px;}xxxxxxxxxx var app = new Vue({ el: '#app', data: { value: '', msg: '' }, methods: { input() { let val = '' try{ val = eval(this.value) } catch { val = this.value } this.msg = val } } })