## Tooltip

```jsx
<Tooltip placement="leftTop" overlay="提示文字">
  <Button>左上</Button>
</Tooltip>
```


|参数|类型|默认值|说明|
|---|----|---|------|
|overlayClassName | string | dh | additional className added to popup overlay |
|trigger | string[] | ['hover'] | which actions cause tooltip shown. enum of 'hover','click','focus' |
|mouseEnterDelay | number | 0 | delay time to show when mouse enter.unit: s. |
|mouseLeaveDelay | number | 0.1 | delay time to hide when mouse leave.unit: s. |
|overlayStyle | Object |  | additional style of overlay node |
|wrapStyle | Object |  | additional style of wrap node |
|prefixCls | String | kuma-tooltip | prefix class name |
|onVisibleChange | Function |  | call when visible is changed |
|visible | boolean |  | whether tooltip is visible |
|defaultVisible | boolean |  | whether tooltip is visible initially |
|placement | String 或 Object |  | one of ['left','right','top','bottom', 'topLeft', 'topRight', 'bottomLeft','bottomRight'] or alignConfig of [dom-align](https://github.com/yiminghe/dom-align)
|align | Object: alignConfig of [dom-align](https://github.com/yiminghe/dom-align) |  | only valid when placement's type is String. value will be merged into placement's align config. note: can only accept offset and targetOffset overlay  React.Element  popup content |
|getTooltipContainer | function |  | function returning html node which will act as tooltip contaier |