Model

index.html

<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id="app-1">
  <p>{{ message }}</p>
  <input v-model="message">
</div>
  
<script>
var app6 = new Vue({
  el: '#app-1',
  data: {
    message: 'Hello Vue :)'
  }
})
</script>