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

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

update zh-cn/application-dev/ability/stage-ability.md.
Signed-off-by: N ql <qianli16@huawei.com>
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--- a/zh-cn/application-dev/ability/stage-ability.md
+++ b/zh-cn/application-dev/ability/stage-ability.md
@@ -180,6 +180,7 @@ context.startAbility(want).then((data) => {
 ```
 从DeviceManager获取指定设备的deviceId，具体示例代码如下：
 ```ts
+import deviceManager from '@ohos.distributedHardware.deviceManager';
 function getRemoteDeviceId() {
    if (typeof dmClass === 'object' && dmClass != null) {
        var list = dmClass.getTrustedDeviceListSync();