feat(Locale): add useCurrentLang method (#11517)

packages/vant/src/locale/README.md

@@ -79,3 +79,23 @@ Current supported languages:
 ### Add new language
 
 If you can’t find the language you need, please send us a Pull Request to add the new language pack, you can refer to [Add German language pack](https://github.com/vant-ui/vant/pull/7245) PR.
+
+### Get Current Lang
+
+You can get the current language using `useCurrentLang` method.
+
+- **Type:**
+
+```ts
+function useCurrentLang(): Ref<string>;
+```
+
+- **Example:**
+
+```ts
+import { useCurrentLang } from 'vant';
+
+const currentLang = useCurrentLang();
+
+console.log(currentLang.value); // --> 'en-US'
+```

packages/vant/src/locale/README.zh-CN.md

@@ -77,6 +77,26 @@ Locale.add(messages);
 
 > 在 [这里](https://github.com/vant-ui/vant/tree/main/packages/vant/src/locale/lang) 查看所有的语言包源文件。
 
+### 获取当前语言
+
+你可以通过 `useCurrentLang` 方法来获取当前使用的语言。
+
+- **类型：**
+
+```ts
+function useCurrentLang(): Ref<string>;
+```
+
+- **示例：**
+
+```ts
+import { useCurrentLang } from 'vant';
+
+const currentLang = useCurrentLang();
+
+console.log(currentLang.value); // --> 'zh-CN'
+```
+
 ## 常见问题
 
 ### 找不到所需的语言包？

packages/vant/src/locale/index.ts

@@ -25,4 +25,6 @@ export const Locale = {
   },
 };
 
+export const useCurrentLang = () => lang;
+
 export default Locale;