Changelog: update for 2.3.8 (#11127)

CHANGELOG.en-US.md

 ## Changelog
 
+### 2.3.8
+
+*2018-05-11*
+
+- Fixed DatePicker panel jumping to the current month after picking a date in a non-current month when `type` is dates, #10973
+- Fixed clearable Input still displaying the clear icon when readonly, #10912
+- Fixed closing the DatePicker panel without changing the value incorrectly triggering the `change` event, #11017
+- Fixed keyboard navigation not working properly when Select has grouped options, #11058
+- Added `prefix` named slot for Select, #11063
+- Added 'clearValidate` method for FormItem, #11076
+- Added `checkOnClickNode` attribute for Tree, #11111
+
 ### 2.3.7
 
 *2018-04-29*

CHANGELOG.es.md

 ## Changelog
 
+### 2.3.8
+
+*2018-05-11*
+
+- Fixed DatePicker panel jumping to the current month after picking a date in a non-current month when `type` is dates, #10973
+- Fixed clearable Input still displaying the clear icon when readonly, #10912
+- Fixed closing the DatePicker panel without changing the value incorrectly triggering the `change` event, #11017
+- Fixed keyboard navigation not working properly when Select has grouped options, #11058
+- Added `prefix` named slot for Select, #11063
+- Added 'clearValidate` method for FormItem, #11076
+- Added `checkOnClickNode` attribute for Tree, #11111
+
 ### 2.3.7
 
 *2018-04-29*

CHANGELOG.zh-CN.md

 ## 更新日志
 
+### 2.3.8
+
+*2018-05-11*
+
+- 修复 `type` 为 dates 的 DatePicker 在选择非当前月的日期后，面板会跳转至当前月的问题，#10973
+- 修复可清空的只读 Input 仍会显示清空图标的问题，#10912
+- 修复范围选择的 DatePicker 在未改变值的情况下关闭下拉面板仍会触发 `change` 事件的问题，#11017
+- 修复 Select 在有分组选项时不能正确通过键盘导航的问题，#11058
+- 新增 Select 的 `prefix` 具名 slot，#11063
+- 新增 FormItem 的 `clearValidate` 方法，#11076
+- 新增 Tree 的 `checkOnClickNode` 属性，#11111
+
 ### 2.3.7
 
 *2018-04-29*

examples/docs/zh-CN/upload.md

@@ -411,7 +411,7 @@
 | show-file-list | 是否显示已上传文件列表 | boolean | — | true |
 | drag | 是否启用拖拽上传 | boolean | — | false |
 | accept | 接受上传的[文件类型](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-accept)（thumbnail-mode 模式下此参数无效）| string | — | — |
-| on-preview | 点击已上传的文件链接时的钩子, 可以通过 file.response 拿到服务端返回数据 | function(file) | — | — |
+| on-preview | 点击文件列表中已上传的文件时的钩子 | function(file) | — | — |
 | on-remove | 文件列表移除文件时的钩子 | function(file, fileList) | — | — |
 | on-success | 文件上传成功时的钩子 | function(response, file, fileList) | — | — |
 | on-error | 文件上传失败时的钩子 | function(err, file, fileList) | — | — |