ant-design-vue/antdv-demo/docs/collapse/demo/mix.md

#### 面板嵌套 嵌套折叠面板。 #### Nested panel `Collapse` is nested inside the `Collapse`.

<template>
  <div>
    <a-collapse @change="changeActivekey">
      <a-collapse-panel key="1" header="This is panel header 1">
        <a-collapse default-active-key="4">
          <a-collapse-panel key="4" header="This is panel nest panel">
            <p>{{ text }}</p>
          </a-collapse-panel>
        </a-collapse>
      </a-collapse-panel>
      <a-collapse-panel key="2" header="This is panel header 2" :disabled="false">
        <p>{{ text }}</p>
      </a-collapse-panel>
      <a-collapse-panel key="3" header="This is panel header 3">
        <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.`,
    };
  },
  methods: {
    changeActivekey(key) {
      console.log(key);
    },
  },
};
</script>