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+新特性：
+- 新增 Transfer 组件
+- 新增 transition 的文档，现在用户可以使用内置 transition 了
+- Slider 新增垂直模式，使用 `vertical` 属性即可打开，#4410（by @devange）
+- CheckboxGroup 新增按钮模式，#3697（by @mdartic）
+- Table
+  - 新增 `setCurrentRow` 方法，#4390
+  - 新增表尾合计行的功能，提供 `show-summary`、`sum-text` 和 `summary-method`，#4484
+- Dialog 新增 `before-close` 属性，#4432
+- Upload
+  - 新增 `disabled` 属性，#4473
+  - `on-change` 事件现在也会在添加文件后触发，#4447
+- Switch 新增 `on-value` 和 `off-value` 属性，支持自定义两种状态的值，#4403 
+- DatePicker
+  - 新增 `default-value` 属性，用于设定下拉框初次弹出时显示的日期，#4222（by @wacky6）
+  - 支持动态改变 `type`，#4417（by @coffeedeveloper）
+
+修复：
+- Select 和 Table 的某些功能与 Vue 2.3.x 不兼容的问题，#4518
+- DatePicker 的 `disabledDate` 对手动在输入框中输入的值无效的问题，#4309
+- Tree 的树节点 ID 为数字 0 时的一些问题，#4415
+- TimePicker 在完成选择后数字不居中显示的问题，#4425（by @pengchongfu）
+- Autocomplete 在输入中文时频繁触发搜索方法的问题，#4393（by @qazbnm456）
+- Upload 不能选择同一个文件的问题，#4461
+- 嵌套在 FormItem 中的按钮样式的 RadioGroup 的样式问题，#4336
+
+非兼容性更新:
+- 最低兼容 Vue 2.3.0
+
+New features:
+- New component: Transfer
+- Now you can use our pre-defined transitions
+- Vertical mode for Slider, can be activated by the `vertical` attribute, #4410 (by @devange)
+- Button style for CheckboxGroup, #3697 (by @mdartic)
+- Table
+  - Added `setCurrentRow` method, #4390
+  - Added summary row, with three attributes: `show-summary`, `sum-text` and `summary-method`, #4484
+- Dialog now has a `before-close` hook, #4432
+- Upload
+  - Added `disabled` attribute, #4473
+  - `on-change` now also triggers when a file is added, #4447
+- Switch now supports `on-value` and `off-value`, so that you can customize its values, #4403 
+- DatePicker
+  - Added `default-value` attribute for initially displayed date in the dropdown, #4222 (by @wacky6)
+  - `type` now supports dynamic updates, #4417 (by @coffeedeveloper)
+
+Fixes:
+- Compatibility issues of Select and Table with Vue 2.3.x, #4518
+- `disabledDate` of DatePicker having no effect on typed value in the input box, #4309
+- An issue when the key of a Tree node is number 0, #4415
+- TimePicker number not align when picked, #4425 (by @pengchongfu)
+- Autocomplete frequently triggering searching method when typing Chinese, #4393 (by @qazbnm456)
+- Upload not able to select the same file multiple times, #4461
+- Style bug of RadioGroup when nested in a FormItem, #4336
+
+Breaking changes:
+- Only compatible with Vue 2.3.0+
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