doc: update doc

Author: tangjinzhou

components/config-provider/index.en-US.md

@@ -56,6 +56,26 @@ Some components use dynamic style to support wave effect. You can config `csp` p
 | pageHeader | Unify the ghost of pageHeader ,Ref [pageHeader](<(/components/page-header)> | { ghost:boolean } | 'true' | 1.5.0 |
 | transformCellText | Table data can be changed again before rendering. The default configuration of general user empty data. | Function({ text, column, record, index }) => any | - | 1.5.4 ｜ |
 
+### ConfigProvider.config() `3.0.0+`
+
+Setting `Modal`、`Message`、`Notification` rootPrefixCls.
+
+```jsx
+ConfigProvider.config({
+  prefixCls: 'ant',
+});
+```
+
+or
+
+```jsx
+// some cinfig support reactively, you can change prefixCls.value = 'other'
+const prefixCls = ref('ant');
+ConfigProvider.config({
+  prefixCls,
+});
+```
+
 ## FAQ
 
 #### Does the locale problem still exist in DatePicker even if ConfigProvider `locale` is used?

components/config-provider/index.zh-CN.md

@@ -54,8 +54,29 @@ ConfigProvider 使用 Vue 的 [provide / inject](https://vuejs.org/v2/api/#provi
 | getPopupContainer | 弹出框（Select, Tooltip, Menu 等等）渲染父节点，默认渲染到 body 上。 | Function(triggerNode, dialogContext) | () => document.body |  |
 | locale | 语言包配置，语言包可到 [ant-design-vue/es/locale](http://unpkg.com/ant-design-vue/es/locale/) 目录下寻找 | object | - | 1.5.0 |
 | pageHeader | 统一设置 pageHeader 的 ghost，参考 [pageHeader](<(/components/page-header)>) | { ghost: boolean } | 'true' | 1.5.0 |
+| prefixCls | 设置统一样式前缀。注意：需要配合 `less` 变量 `@ant-prefix` 使用 | string | `ant` |  |
 | transformCellText | Table 数据渲染前可以再次改变，一般用户空数据的默认配置 | Function({ text, column, record, index }) => any | - | 1.5.4 ｜ |
 
+### ConfigProvider.config() `3.0.0+`
+
+设置 `Modal`、`Message`、`Notification` rootPrefixCls。
+
+```jsx
+ConfigProvider.config({
+  prefixCls: 'ant',
+});
+```
+
+or
+
+```jsx
+// 如下配置支持响应式数据，你可以通过 prefixCls.value = 'other' 直接改变
+const prefixCls = ref('ant');
+ConfigProvider.config({
+  prefixCls,
+});
+```
+
 ## FAQ
 
 #### 为什么我使用了 ConfigProvider `locale`，时间类组件的国际化还有问题？

components/modal/index.en-US.md

@@ -9,11 +9,7 @@ Modal dialogs.
 
 ## When To Use
 
-When requiring users to interact with the application, but without jumping to a new page and interrupting
-the user's workflow, you can use `Modal` to create a new floating layer over the current page to get user
-feedback or display information.
-Additionally, if you need show a simple confirmation dialog, you can use `antd.Modal.confirm()`,
-and so on.
+When requiring users to interact with the application, but without jumping to a new page and interrupting the user's workflow, you can use `Modal` to create a new floating layer over the current page to get user feedback or display information. Additionally, if you need show a simple confirmation dialog, you can use `antd.Modal.confirm()`, and so on.
 
 ## API
 
@@ -89,7 +85,7 @@ The items listed above are all functions, expecting a settings object as paramet
 | zIndex | The `z-index` of the Modal | Number | 1000 |  |
 | onCancel | Specify a function that will be called when the user clicks the Cancel button. The parameter of this function is a function whose execution should include closing the dialog. You can also just return a promise and when the promise is resolved, the modal dialog will also be closed | function | - |  |
 | onOk | Specify a function that will be called when the user clicks the OK button. The parameter of this function is a function whose execution should include closing the dialog. You can also just return a promise and when the promise is resolved, the modal dialog will also be closed | function | - |  |
-| parentContext | The parent context of the popup is generally used to get the parent provider, such as the configuration of `ConfigProvider` | vue instance | - |  |
+| appContext | The context of the pop-up window is generally used to obtain content such as global registered components, vuex, etc. | - | - |  |
 
 All the `Modal.method`s will return a reference, and then we can update and close the modal dialog by the reference.
 
@@ -116,3 +112,22 @@ router.beforeEach((to, from, next) => {
   Modal.destroyAll();
 })
 ```
+
+## FAQ
+
+### Why can't the Modal method obtain global registered components, context, vuex, etc. and ConfigProvider `locale/prefixCls` configuration, and can't update data responsively?
+
+Call the Modal method directly, and the component will dynamically create a new Vue entity through `Vue.render`. Its context is not the same as the context where the current code is located, so the context information cannot be obtained.
+
+When you need context information (for example, using a globally registered component), you can pass the current component context through the `appContext` property. When you need to keep the property responsive, you can use the function to return:
+
+```tsx
+import { getCurrentInstance } from 'vue';
+
+const appContext = getCurrentInstance().appContext;
+const title = ref('some message');
+Modal.confirm({
+  title: () => title.value, // the change of title will update the title in confirm synchronously
+  appContext,
+});
+```

components/modal/index.zh-CN.md

@@ -89,7 +89,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/3StSdUlSH/Modal.svg
 | zIndex | 设置 Modal 的 `z-index` | Number | 1000 |  |
 | onCancel | 取消回调，参数为关闭函数，返回 promise 时 resolve 后自动关闭 | function | 无 |  |
 | onOk | 点击确定回调，参数为关闭函数，返回 promise 时 resolve 后自动关闭 | function | 无 |  |
-| parentContext | 弹窗的父级上下文，一般用于获取父级 provider， 如获取 `ConfigProvider` 的配置 | vue instance | - |  |
+| appContext | 弹窗的上下文，一般用于获取全局注册组件、vuex 等内容 | - | - |  |
 
 以上函数调用后，会返回一个引用，可以通过该引用更新和关闭弹窗。
 
@@ -116,3 +116,22 @@ router.beforeEach((to, from, next) => {
   Modal.destroyAll();
 })
 ```
+
+## FAQ
+
+### 为什么 Modal 方法不能获取 全局注册组件、context、vuex 等内容和 ConfigProvider `locale/prefixCls` 配置， 以及不能响应式更新数据 ？
+
+直接调用 Modal 方法，组件会通过 `Vue.render` 动态创建新的 Vue 实体。其 context 与当前代码所在 context 并不相同，因而无法获取 context 信息。
+
+当你需要 context 信息（例如使用全局注册的组件）时，可以通过 `appContext` 属性传递当前组件 context, 当你需要保留属性响应式时，你可以使用函数返回：
+
+```tsx
+import { getCurrentInstance } from 'vue';
+
+const appContext = getCurrentInstance().appContext;
+const title = ref('some message');
+Modal.confirm({
+  title: () => title.value, // 此时 title 的改变，会同步更新 confirm 中的 title
+  appContext,
+});
+```