---
title: 对齐
order: 6
---

通过 `placement` 可以自定义对齐方式。

```jsx
import Overlay from '@alifd/overlay';

const { Popup } = Overlay;

const style = {
  position: 'relative',
  height: 150,
  margin: 50,
  border: '1px solid #eee',
  textAlign: 'center',
};

ReactDOM.render(
  <div id="containerId" style={style}>
    <Overlay
      target="containerId"
      container={() => document.getElementById('containerId')}
      visible
      points={['br', 'tl']}
    >
      <button>br tl</button>
    </Overlay>
    <Overlay target="containerId" visible points={['tc', 'tc']}>
      <button>tc tc</button>
    </Overlay>
    <Overlay target="containerId" visible points={['bl', 'tr']}>
      <button>bl tr</button>
    </Overlay>
    <Overlay target="containerId" visible points={['cr', 'cr']}>
      <button>cr cr</button>
    </Overlay>
    <Overlay target="containerId" visible points={['br', 'br']}>
      <button>br br</button>
    </Overlay>
    <Overlay target="containerId" visible points={['tc', 'bc']}>
      <button>tc bc</button>
    </Overlay>
    <Overlay target="containerId" visible points={['bl', 'bl']}>
      <button>bl bl</button>
    </Overlay>
    <Overlay target="containerId" visible points={['cl', 'cl']}>
      <button>cl cl</button>
    </Overlay>
    <Overlay target="containerId" visible points={['cc', 'cc']}>
      <button>cc cc</button>
    </Overlay>
  </div>,
  mountNode
);
```