import { WhiteSpace, WingBlank, Button } from 'antd-mobile';let WhiteSpaceExample = React.createClass({  render() {    return (      <div className="button-container">        <WhiteSpace />        <WingBlank>          <Button type="primary">上下留白8px</Button>        </WingBlank>        <WhiteSpace />        <div style={{ borderTop: '1px solid #2DB7F5' }} />        <WhiteSpace size={16} />        <WingBlank>          <Button type="primary">上下留白16px</Button>        </WingBlank>        <WhiteSpace size={16} />        <div style={{ borderTop: '1px solid #2DB7F5' }} />        <WhiteSpace size={32} />        <WingBlank>          <Button type="primary">上下留白32px</Button>        </WingBlank>        <WhiteSpace size={32} />        <div style={{ borderTop: '1px solid #2DB7F5' }} />      </div>    );  },});ReactDOM.render(<WhiteSpaceExample />, mountNode);