update zh-cn/application-dev/ability/stage-call.md.

Signed-off-by: Nql <qianli16@huawei.com>

zh-cn/application-dev/ability/stage-call.md

@@ -134,8 +134,7 @@ context.startAbilityByCall({
     console.error(TAG + 'get caller failed with ' + error)
 })
 ```
-   在跨设备场景下，需指定对端设备deviceId，具体获取接口参照[DeviceManager](https://gitee.com/openharmony/device_manager/blob/master/README_zh.md)。应用开发者 
-   根据实际需要做相应处理。具体示例代码如下：
+在跨设备场景下，需指定对端设备deviceId。应用开发者 根据实际需要做相应处理。具体示例代码如下：
 ```ts
 let TAG = '[MainAbility] '
 var caller = undefined
@@ -159,7 +158,23 @@ context.startAbilityByCall({
     console.error(TAG + 'get remote caller failed with ' + error)
 })
 ```
-   在跨设备场景下，需要向用户申请数据同步的权限。具体示例代码如下：
+从DeviceManager获取指定设备的deviceId，具体示例代码如下：
+```ts
+function getRemoteDeviceId() {
+    if (typeof dmClass === 'object' && dmClass != null) {
+        var list = dmClass.getTrustedDeviceListSync();
+        if (typeof (list) == 'undefined' || typeof (list.length) == 'undefined') {
+            console.log("MainAbility onButtonClick getRemoteDeviceId err: list is null");
+            return;
+        }
+        console.log("MainAbility onButtonClick getRemoteDeviceId success:" + list[0].deviceId);
+        return list[0].deviceId;
+    } else {
+        console.log("MainAbility onButtonClick getRemoteDeviceId err: dmClass is null");
+    }
+}
+```
+在跨设备场景下，需要向用户申请数据同步的权限。具体示例代码如下：
 ```ts
 let context = this.context
 let permissions = ohos.permission.DISTRIBUTED_DATASYNC