### Before submitting a pull request, please make sure the following is done:

### 提交 PR 前请确保完成以下内容:

1. Fork [the repository](https://github.com/youzan/vant) and create your branch from `dev`.
2. Follow the [contributing guide](./CONTRIBUTING.md) to setup your develop environment.
2. If you've added code that should be tested, add tests!
3. If you've changed APIs, update the documentation.
4. Ensure the test suite passes (`npm test`).
5. Make sure your code lints (`npm run lint`).
6. Describe your pull request.

### 请认真写 PR 的标题，会用于生成 change log。

### Please remove the above lines when you submit this pull request, also please fill in the changes you've made in this pull request.

### 提交 PR 前 请把以上内容删除，并填写以下内容。

Fixes #xx(issue number here), remove this line if no related issue.

Changes you made in this pull request:

- some change
- another change