feat(signature): export clear and submit method (#12654)

packages/vant/src/signature/README.md

@@ -106,6 +106,8 @@ Use [ref](https://vuejs.org/guide/essentials/template-refs.html) to get Signatur
 | Name | Description | Attribute | Return value |
 | --- | --- | --- | --- |
 | resize `v4.7.3` | Resize Signature when container element resized or visibility changed | - | - |
+| clear `v4.8.6` | Can be called to clear the signature | - | - |
+| submit `v4.8.6` | Trigger the `submit` event, which is equivalent to clicking the confirm button. | - | - |
 
 ### Types
 

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

@@ -106,6 +106,8 @@ export default {
 | 方法名 | 说明 | 参数 | 返回值 |
 | --- | --- | --- | --- |
 | resize `v4.7.3` | 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 | - | - |
+| clear `v4.8.6` | 可调用此方法来清除签名 | - | - |
+| submit `v4.8.6` | 触发 `submit` 事件，与点击确认按钮的效果等价 | - | - |
 
 ### 类型定义
 

packages/vant/src/signature/Signature.tsx

@@ -181,6 +181,8 @@ export default defineComponent({
 
     useExpose<SignatureExpose>({
       resize,
+      clear,
+      submit,
     });
 
     return () => (

packages/vant/src/signature/types.ts

@@ -3,6 +3,8 @@ import type { SignatureProps } from './Signature';
 
 export type SignatureExpose = {
   resize: () => void;
+  clear: () => void;
+  submit: () => void;
 };
 
 export type SignatureInstance = ComponentPublicInstance<