update js-apis-fileio.md

Signed-off-by: N raoxian <raoxian@huawei.com>

update js-apis-fileio.md
Signed-off-by: N raoxian <raoxian@huawei.com>
fa191099 · raoxian · 0785b077 · fa191099
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zh-cn/application-dev/reference/apis/js-apis-fileio.md zh-cn/application-dev/reference/apis/js-apis-fileio.md +8 -0

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--- a/zh-cn/application-dev/reference/apis/js-apis-fileio.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-fileio.md
@@ -600,6 +600,14 @@ openSync(path:string, flags?:number, mode?:number): number
  ```js
  let fd = fileio.openSync(path, 0o102, 0o640);
  ```
+  ```js
+  let fd = fileio.openSync(path, 0o102, 0o666);
+  fileio.writeSync(fd, 'hello world');
+  let fd = fileio.openSync(path, 0o2002);
+  fileio.writeSync(fd, 'hello world');
+  let num = fileio.readSync(fd, new ArrayBuffer(4096), {position: 0});
+  console.info("num == " + num);
+  ```


 ## fileio.read