MVVM模式

<div id="demo">
    姓：<input type="text" v-model="firstName">
    名：<input type="text" v-model="lastName">
    <hr>
    姓名：{{firstName+lastName}}
</div>

<script>
    var vm=new Vue({
        el:"#demo",
        data:{
            firstName:"huang",
            lastName:"jack",
        }
    });
</script>