diff --git a/zh-cn/application-dev/reference/apis/js-apis-inputdevice.md b/zh-cn/application-dev/reference/apis/js-apis-inputdevice.md
index 80af951e3c3ce1fb6ef0501f32acc68dff09e4fb..564444daffe89d2300a83a415af4de76bc7b47a7 100755
--- a/zh-cn/application-dev/reference/apis/js-apis-inputdevice.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-inputdevice.md
@@ -38,10 +38,10 @@ inputDevice.on("change", (data) => {
     console.log("type: " + data.type + ", deviceId: " + data.deviceId);
     inputDevice.getKeyboardType(data.deviceId, (ret) => {
         console.log("The keyboard type of the device is: " + ret);
-        if (ret == 2 && data.type == 'add') {
+        if (ret == inputDevice.KeyboardType.ALPHABETIC_KEYBOARD && data.type == 'add') {
             // 监听物理键盘已连接。
             isPhysicalKeyboardExist = true;
-        } else if (ret == 2 && data.type == 'remove') {
+        } else if (ret == inputDevice.KeyboardType.ALPHABETIC_KEYBOARD && data.type == 'remove') {
             // 监听物理键盘已断开。
             isPhysicalKeyboardExist = false;
         }
@@ -382,4 +382,4 @@ inputDevice.getKeyboardType().then((ret)=>{
 | ALPHABETIC_KEYBOARD | number   | 2    | 表示全键盘设备。   |
 | DIGITAL_KEYBOARD    | number   | 3    | 表示小键盘设备。   |
 | HANDWRITING_PEN     | number   | 4    | 表示手写笔设备。   |
-| REMOTE_CONTROL      | number   | 5    | 表示遥控器设备。   |
\ No newline at end of file
+| REMOTE_CONTROL      | number   | 5    | 表示遥控器设备。   |