diff --git a/zh-cn/application-dev/reference/apis/js-apis-backgroundTaskManager.md b/zh-cn/application-dev/reference/apis/js-apis-backgroundTaskManager.md
index b02acf3744baea66a0c1338ea16b7c0dc7b54613..d25b9df36393422e0481e5c38a68f513348f1f31 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-backgroundTaskManager.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-backgroundTaskManager.md
@@ -127,6 +127,7 @@ cancelSuspendDelay(requestId: number): void
 
 **示例**：
   ```js
+  let id = 1;
   backgroundTaskManager.cancelSuspendDelay(id);
   ```