<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>在checkbox多选中使用</title>
</head>
<body>
    <div id="app">
        <input type="checkbox" v-model="xuanzhong" value="北京">北京
        <input type="checkbox" v-model="xuanzhong" value="上海">上海
        <input type="checkbox" v-model="xuanzhong" value="广州">广州
        <input type="checkbox" v-model="xuanzhong" value="深圳">深圳
        <br>
        <p>{{xuanzhong}}</p>
    </div>

    <script src="../js/vue.js"></script>

    <script>
        let vm = new Vue({
            el:'#app',
            data:{
                xuanzhong:['北京'],
            }
        });
    </script>
</body>
</html>