docs(Search): update action slot demo (#10133)

packages/vant/src/search/README.md

@@ -107,11 +107,29 @@ Use `action` slot to custom right button, `cancel` event will no longer be Emitt
   @search="onSearch"
 >
   <template #action>
-    <div @click="onSearch">Search</div>
+    <div @click="onClickButton">Search</div>
   </template>
 </van-search>
 ```
 
+```js
+import { ref } from 'vue';
+import { Toast } from 'vant';
+
+export default {
+  setup() {
+    const value = ref('');
+    const onSearch = (val) => Toast(val);
+    const onClickButton = () => Toast(value.value);
+    return {
+      value,
+      onSearch,
+      onClickButton,
+    };
+  },
+};
+```
+
 ## API
 
 ### Props

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

@@ -119,11 +119,29 @@ export default {
   @search="onSearch"
 >
   <template #action>
-    <div @click="onSearch">搜索</div>
+    <div @click="onClickButton">搜索</div>
   </template>
 </van-search>
 ```
 
+```js
+import { ref } from 'vue';
+import { Toast } from 'vant';
+
+export default {
+  setup() {
+    const value = ref('');
+    const onSearch = (val) => Toast(val);
+    const onClickButton = () => Toast(value.value);
+    return {
+      value,
+      onSearch,
+      onClickButton,
+    };
+  },
+};
+```
+
 ## API
 
 ### Props

packages/vant/src/search/demo/index.vue

@@ -34,6 +34,7 @@ const value6 = ref('');
 
 const onSearch = (val: string) => Toast(val);
 const onCancel = () => Toast(t('cancel'));
+const onClickButton = () => Toast(value6.value);
 </script>
 
 <template>
@@ -83,7 +84,7 @@ const onCancel = () => Toast(t('cancel'));
       @search="onSearch"
     >
       <template #action>
-        <div @click="onSearch">{{ t('search') }}</div>
+        <div @click="onClickButton">{{ t('search') }}</div>
       </template>
     </van-search>
   </demo-block>