diff --git a/zh-cn/application-dev/reference/apis/js-apis-inputeventclient.md b/zh-cn/application-dev/reference/apis/js-apis-inputeventclient.md
index e5f61c963a42b5d54ab860dd724e9e0111dfef09..393af7dc4883b8c589a9b0f54eb576f28b7d8e23 100755
--- a/zh-cn/application-dev/reference/apis/js-apis-inputeventclient.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-inputeventclient.md
@@ -35,7 +35,7 @@ injectEvent({KeyEvent: KeyEvent}): void
 
 ```js
 try {
-  let backKeyDown = {
+  let backKeyDown: inputEventClient.KeyEvent = {
     isPressed: true,
     keyCode: 2,
     keyDownDuration: 0,
@@ -43,7 +43,7 @@ try {
   }
   inputEventClient.injectEvent({ KeyEvent: backKeyDown });
 
-  let backKeyUp = {
+  let backKeyUp: inputEventClient.KeyEvent = {
     isPressed: false,
     keyCode: 2,
     keyDownDuration: 0,