---
order: 99
debug: true
title:
  zh-CN: 基本
  en-US: Nest
---

## zh-CN

默认选中第一项。

## en-US

Default activate first tab.

````jsx
import { Tabs, Select } from 'antd';

const TabPane = Tabs.TabPane;
const Option = Select.Option;

const positionList = ['left', 'right', 'top', 'bottom'];

const list = new Array(20).fill().map((_, index) => index);

class Demo extends React.Component {
  state = {
    parentPos: undefined,
    childPos: undefined,
    parentType: undefined,
    childType: undefined,
  };

  render() {
    const { parentPos, childPos, parentType, childType } = this.state;

    return (
      <div>
        <Select style={{ width: 200 }} onChange={(val) => { this.setState({ parentPos: val }); }}>
          {positionList.map(pos => (
            <Option value={pos}>Parent - {pos}</Option>
          ))}
        </Select>

        <Select style={{ width: 200 }} onChange={(val) => { this.setState({ childPos: val }); }}>
          {positionList.map(pos => (
            <Option value={pos}>Child - {pos}</Option>
          ))}
        </Select>

        <Select style={{ width: 200 }} onChange={(val) => { this.setState({ parentType: val }); }}>
          <Option value="line">Parent - line</Option>
          <Option value="card">Parent - card</Option>
        </Select>

        <Select style={{ width: 200 }} onChange={(val) => { this.setState({ childType: val }); }}>
          <Option value="line">Child - line</Option>
          <Option value="card">Child - card</Option>
        </Select>

        <Tabs defaultActiveKey="1" tabPosition={parentPos} type={parentType}>
          <TabPane tab="Tab 1" key="1">
            <Tabs defaultActiveKey="1" tabPosition={childPos} type={childType} style={{ height: 300 }}>
              {list.map(key => (
                <TabPane tab={`Tab ${key}`} key={key}>TTTT {key}</TabPane>
              ))}
            </Tabs>
          </TabPane>
          <TabPane tab="Tab 2" key="2">Content of Tab Pane 2</TabPane>
        </Tabs>
      </div>
    );
  }
}

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