types(Tabs): add TabsInstance type (#9174)

* types(Tabs): add TabsInstance type

* types: fix

src/tab/README.md

@@ -280,6 +280,19 @@ Use [ref](https://v3.vuejs.org/guide/component-template-refs.html) to get Tabs i
 | resize | Resize Tabs when container element resized or visibility changed | - | - |
 | scrollTo | Go to specified tab in scrollspy mode | _name: string \| number_ | - |
 
+### Types
+
+Get the type definition of the Tabs instance through `TabsInstance`.
+
+```ts
+import { ref } from 'vue';
+import type { TabsInstance } from 'vant';
+
+const tabsRef = ref<TabsInstance>();
+
+tabsRef.value?.scrollTo(0);
+```
+
 ### Tabs Slots
 
 | Name                | Description               |

src/tab/README.zh-CN.md

@@ -291,6 +291,19 @@ export default {
 | resize | 外层元素大小或组件显示状态变化时，可以调用此方法来触发重绘 | - | - |
 | scrollTo | 滚动到指定的标签页，在滚动导航模式下可用 | _name: string \| number_ | - |
 
+### 类型定义
+
+通过 `TabsInstance` 获取 Tabs 实例的类型定义。
+
+```ts
+import { ref } from 'vue';
+import type { TabsInstance } from 'vant';
+
+const tabsRef = ref<TabsInstance>();
+
+tabsRef.value?.scrollTo(0);
+```
+
 ### Tabs Slots
 
 | 名称                | 说明           |