ant-design-vue/components/collapse/demo/basic.md

<cn>
#### 折叠面板
可以同时展开多个面板，这个例子默认展开了第一个。
</cn>

<us>
#### Collapse
More than one panel can be expanded at a time, the first panel is initialized to be active in this case.
</us>

```html
<template>
  <div>
    <a-collapse v-model="activeKey">
      <a-collapse-panel header="This is panel header 1" key="1">
        <p>{{text}}</p>
      </a-collapse-panel>
      <a-collapse-panel header="This is panel header 2" key="2" :disabled='false'>
        <p>{{text}}</p>
      </a-collapse-panel>
      <a-collapse-panel header="This is panel header 3" key="3" disabled>
        <p>{{text}}</p>
      </a-collapse-panel>
    </a-collapse>
  </div>
</template>
<script>
  export default {
    data () {
      return {
        text: `A dog is a type of domesticated animal.Known for its loyalty and faithfulness,it can be found as a welcome guest in many households across the world.`,
        activeKey: ['1']
      }
    },
    watch: {
      activeKey(key){
        console.log(key)
      }
    },
  }
</script>
```