First of all, thank you for your contribution! :-)
Please makes sure that these checkboxes are checked before submitting your PR, thank you!
* [x] Make sure that you propose PR to right branch: bugfix for `master`, feature for latest active branch `feature-x.x`.
* [x] Make sure that you follow antd's [code convention](https://github.com/ant-design/ant-design/wiki/Code-convention-for-antd).
* [x] Run `npm run lint` and fix those errors before submitting in order to keep consistent code style.
* [x] Rebase before creating a PR to keep commit history clear.
* [ ] Add some descriptions and refer relative issues for you PR.
Extra checklist:
**if** *isBugFix* **:**
* [ ] Make sure that you add at least one unit test for the bug which you had fixed.
**elif** *isNewFeature* **:**
* [ ] Update API docs for the component.
* [ ] Update/Add demo to demonstrate new feature.
* [ ] Update TypeScript definition for the component.
* [ ] Add unit tests for the feature.
* 修复了<Button>{0}</Button> 显示异常的bug
* Fix the bug<Button>{0}</Button> display abnormal
* Fix the bug<Button>{0}</Button> display abnormal
* Unit test writing error
* Unit tests were added to test the rendering of {0}, 0, {false} respectively
* Fix Tooltip won't hide at disabled button
closereact-component/tooltip#18
* change button text in test case
* Add comments for display attribute
* correct test case
