ant-design/components/collapse/demo/extra.md

---
order: 5
title:
  zh-CN: 额外节点
  en-US: Extra node
---

## zh-CN

可以同时展开多个面板，这个例子默认展开了第一个。

## en-US

More than one panel can be expanded at a time, the first panel is initialized to be active in this case.

```jsx
import { Collapse, Select } from 'antd';
import { SettingOutlined } from '@ant-design/icons';

const { Panel } = Collapse;
const { Option } = Select;

function callback(key) {
  console.log(key);
}

const 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.
`;

const genExtra = () => (
  <SettingOutlined
    onClick={event => {
      // If you don't want click extra trigger collapse, you can prevent this:
      event.stopPropagation();
    }}
  />
);

export default () => {
  const [expandIconPosition, setExpandIconPosition] = React.useState('left');

  const onPositionChange = position => {
    setExpandIconPosition(position);
  };
  return (
    <>
      <Collapse
        defaultActiveKey={['1']}
        onChange={callback}
        expandIconPosition={expandIconPosition}
      >
        <Panel header="This is panel header 1" key="1" extra={genExtra()}>
          <div>{text}</div>
        </Panel>
        <Panel header="This is panel header 2" key="2" extra={genExtra()}>
          <div>{text}</div>
        </Panel>
        <Panel header="This is panel header 3" key="3" extra={genExtra()}>
          <div>{text}</div>
        </Panel>
      </Collapse>
      <br />
      <span>Expand Icon Position: </span>
      <Select value={expandIconPosition} style={{ margin: '0 8px' }} onChange={onPositionChange}>
        <Option value="left">left</Option>
        <Option value="right">right</Option>
      </Select>
    </>
  );
};
```