docs: update faq013.md

docs/docs/faq/faq013.md

@@ -10,9 +10,28 @@ tags: [FAQ]
 ## 处理方式
 ### 【推荐】升级到 Engine Verison 1.0.11 以上
 ### 新增 save propsReducer
-通过新增 Save 态的 propsReducer，将 hidden props 去掉。
-参考：
-[https://github.com/alibaba/lowcode-demo/blob/main/src/sample-plugins/delete-hidden-transducer/index.ts](https://github.com/alibaba/lowcode-demo/blob/main/src/sample-plugins/delete-hidden-transducer/index.ts)
+
+通过新增 Save 态的 propsReducer，将 hidden props 去掉。可以参考下面的代码：
+
+```typescript
+import { project } from '@alilc/lowcode-engine';
+import { IPublicEnumTransformStage } from '@alilc/lowcode-types';
+
+export const deleteHiddenTransducer = (ctx: any) => {
+  return {
+    name: 'deleteHiddenTransducer',
+    async init() {
+      project.addPropsTransducer((props: any): any => {
+        delete props.hidden;
+        return props;
+      }, IPublicEnumTransformStage.Save);
+    },
+  };
+}
+
+deleteHiddenTransducer.pluginName = 'deleteHiddenTransducer';
+
+```
 
 ### 导出 schema 使用 Save 态
 ```typescript