update zh-cn/application-dev/windowmanager/application-window-stage.md.

Signed-off-by: N@ge-yafang <geyafang@huawei.com>
Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/windowmanager/application-window-stage.md

@@ -241,7 +241,7 @@ class MainAbility extends Ability {
                    console.info('Succeeded in enabling the full-screen mode. Data: ' + JSON.stringify(data));
                });
                // 2.实现沉浸式效果。方式二：设置导航栏、状态栏不显示。
-               var names = null;
+               var names = [];
                windowClass.setSystemBarEnable(names, (err, data) => {
                    if (err.code) {
                        console.error('Failed to set the system bar to be visible. Cause:' + JSON.stringify(err));