Vant UI中van-collapse下拉折叠面板默认展开第一项的方法

<!--下拉折叠面板-->
  <van-collapse class="collapse" v-model="activeNames" is-link="false">
    <van-collapse-item title="" :name="index">
      <!--展开后显示的内容-->
      <span class="coll_show">制定拜访计划</span>
      <span class="coll_show">保险保障分析</span>
      <span class="coll_show">制作计划书</span>
      <span class="coll_show">会客厅讲解</span>
      <span class="coll_show">
        <van-cell @click="showEdit">修改备注</van-cell>
        <van-popup v-model="showRemark">
          <p>修改备注</p>
          <fORM action="/">
            <input class="text" placeholder="最多输入50个字" type="text">
            <input class="btn1" type="button" value="取消">
            <input class="btn2" type="submit" value="提交">
          </form>
        </van-popup>
      </span>
    </van-collapse-item>
  </van-collapse>

export default {
  data() {
    return {
      activeNames: ['1'],
    };
  },
};

export default {
  data() {
    return {
      activeNames: [0],
    };
  },
};

export default {
  data() {
    return {
      activeNames: 0,
    };
  },
};

<div class="small-area-details" v-for="(listItem, listIndex) in GoldAlbumList" :key="listIndex">
   <van-collapse v-model="activeNames" :border="false">
     <van-collapse-item
       title="标题"
       :name="listIndex">
     </van-collapse-item>
   </van-collapse>
</div>

<script>
export default {
data() {
    return {
        activeNames: [0] //不能是['0']
        }
    }
}
</script>