> For AI agents: the complete documentation index is available at https://rspress.rs/zh/llms.txt, the full documentation bundle is available at https://rspress.rs/zh/llms-full.txt.

# useLang

`useLang` 返回当前语言代码，便于渲染多语言文案或按语言跳转路由。

- **类型：** `() => string`

该 Hook 会从运行时上下文中读取语言，并在用户切换语言时保持同步。

```tsx preview
import { useLang } from '@rspress/core/runtime';

export default function Comp() {
  const lang = useLang();
  return <span>当前语言：{lang}</span>;
}
```