<body>
<div id="app">
<select name="" id="" v-model="selected">
<option value="shanghai">上海</option>
<option value="beijing">北京</option>
<option value="nanjing">南京</option>
<option value="shenzhen">深圳</option>
</select>
您已选择：{{selected}}
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
new Vue({
el:'#app',
data:{
selected: ''
}
})
</script>
</body>