update zh-cn/application-dev/database/data-persistence-by-preferences.md.

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

update zh-cn/application-dev/database/data-persistence-by-preferences.md.
Signed-off-by: N 葛亚芳 <geyafang@huawei.com>
78feb657 · 葛亚芳 · Gitee · 9ae6307f · 78feb657
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     console.error(`Failed to delete preferences. Code:${err.code}, message:${err.message}`);
   }
   ```
+
+## 相关实例
+
+针对首选项开发，有以下相关实例可供参考：
+
+- [`Preferences`：首选项（ArkTS）（API9）](https://gitee.com/openharmony/applications_app_samples/tree/OpenHarmony-3.2-Release/data/Preferences)
+
+- [首选项（ArkTS）（API9）](https://gitee.com/openharmony/codelabs/tree/master/Data/Preferences)
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