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();
    }}
  />
);

class Demo extends React.Component {
  state = {
    expandIconPosition: 'left',
  };

  onPositionChange = expandIconPosition => {
    this.setState({ expandIconPosition });
  };

  render() {
    const { expandIconPosition } = this.state;
    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={this.onPositionChange}
        >
          <Option value="left">left</Option>
          <Option value="right">right</Option>
        </Select>
      </>
    );
  }
}

ReactDOM.render(<Demo />, mountNode);
```