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 788500960d79c5cf3cd5f19c27bf32e5e036e199..fe12382dceca032ae728ba41e210272081014e94 100755
--- a/zh-cn/application-dev/reference/apis/js-apis-inputeventclient.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-inputeventclient.md
@@ -32,7 +32,7 @@ injectEvent({KeyEvent: KeyEvent}): void
 
 ```js
 try {
-  let backKeyDown = {
+  let backKeyDown: inputEventClient.KeyEvent = {
     isPressed: true,
     keyCode: 2,
     keyDownDuration: 0,
@@ -40,7 +40,7 @@ try {
   }
   inputEventClient.injectEvent({ KeyEvent: backKeyDown });
 
-  let backKeyUp = {
+  let backKeyUp: inputEventClient.KeyEvent = {
     isPressed: false,
     keyCode: 2,
     keyDownDuration: 0,