1.效果如下：
2.代碼
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 練習 - 下拉框</title>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
</head>
<body>
<div id="app">
<select v-model="aaa" name="fruit">
<option value="">請選擇瀏覽器</option>
<option value="www.baidu.com">百度</option>
<option value="www.sogou.com">搜狗</option>
<option value="www.google.com">谷歌</option>
</select>
<br> <br>
<br> <br>
<br> <br>
<div id="output">
網站地址是: {{aaa}}
</div>
</div>
<script>
new Vue({
el: '#app',
data: {
aaa: ''
}
})
</script>
</body>
</html>