react（98）--开启flex布局

    <Row type="flex" justify="space-between" align="bottom">
      <Col span={4}>
        <DemoBox value={100}>col-4</DemoBox>
      </Col>
      <Col span={4}>
        <DemoBox value={50}>col-4</DemoBox>
      </Col>
      <Col span={4}>
        <DemoBox value={120}>col-4</DemoBox>
      </Col>
      <Col span={4}>
        <DemoBox value={80}>col-4</DemoBox>
      </Col>
    </Row>