SOURCE

const ap=new Vue({
  el:'#app', 
	data:{ 
	  message:'v-model使用',      
      age:0,  
	},	        
}); 

<script src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<div id="app" style="max-width:800px;height:400px">	
	<h2>v-model使用</h2>
    <input v-model.lazy="message"/>
<input type="number" v-model.number="age"/>
<h2>{{age}} {{typeof age}}</h2>

<input type="number" v-model.trim="message"/>
</div>