:::demo 示例

```html
<template>
    <div>
         <v-checkbox-group
            v-model="checkedCities1"
            :min="1"
            :max="2">
            <v-checkbox v-for="city in cities1" :label="city" :key="city">{{city}}</v-checkbox>
        </v-checkbox-group>
    </div>
</template>

<script>
    export default{
        data() {
            return {
                checkedCities1: ['上海', '北京'],
                cities1: ['上海', '北京', '广州', '深圳']
            };
        },
    }
</script>
```
:::