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---
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order: 99
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debug: true
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title:
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zh-CN: 基本
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en-US: Nest
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---
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## zh-CN
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默认选中第一项。
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## en-US
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Default activate first tab.
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```jsx
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import { Tabs, Select } from 'antd';
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const TabPane = Tabs.TabPane;
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const Option = Select.Option;
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const positionList = ['left', 'right', 'top', 'bottom'];
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const list = new Array(20).fill().map((_, index) => index);
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class Demo extends React.Component {
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state = {
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parentPos: undefined,
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childPos: undefined,
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parentType: undefined,
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childType: undefined,
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};
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render() {
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const { parentPos, childPos, parentType, childType } = this.state;
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return (
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<div>
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<Select
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style={{ width: 200 }}
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onChange={val => {
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this.setState({ parentPos: val });
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}}
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>
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{positionList.map(pos => (
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<Option key={pos} value={pos}>
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Parent - {pos}
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</Option>
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))}
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</Select>
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<Select
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style={{ width: 200 }}
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onChange={val => {
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this.setState({ childPos: val });
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}}
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>
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{positionList.map(pos => (
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<Option key={pos} value={pos}>
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Child - {pos}
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</Option>
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))}
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</Select>
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<Select
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style={{ width: 200 }}
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onChange={val => {
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this.setState({ parentType: val });
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}}
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>
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<Option value="line">Parent - line</Option>
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<Option value="card">Parent - card</Option>
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</Select>
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<Select
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style={{ width: 200 }}
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onChange={val => {
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this.setState({ childType: val });
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}}
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>
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<Option value="line">Child - line</Option>
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<Option value="card">Child - card</Option>
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</Select>
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<Tabs defaultActiveKey="1" tabPosition={parentPos} type={parentType}>
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<TabPane tab="Tab 1" key="1">
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<Tabs
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defaultActiveKey="1"
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tabPosition={childPos}
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type={childType}
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style={{ height: 300 }}
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>
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{list.map(key => (
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<TabPane tab={`Tab ${key}`} key={key}>
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TTTT {key}
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</TabPane>
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))}
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</Tabs>
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</TabPane>
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<TabPane tab="Tab 2" key="2">
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Content of Tab Pane 2
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</TabPane>
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</Tabs>
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</div>
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);
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}
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}
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ReactDOM.render(<Demo />, mountNode);
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```
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