<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div id="app">
<select v-model="selected">
<option>A</option>
<option>B</option>
<option>C</option>
</select>
<span>{{selected}}</span>
</div>
</body>
</html>
<script src="../js/vue.js"></script>
<script>
var app=new Vue({
el:"#app",
data:{
selected:''
},
})
</script>