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https://gitee.com/ningningW/docs-yuanma/pulls/21754由 ningning 提交于
update zh-cn/application-dev/reference/apis/js-apis-wallpaper.md. Signed-off-by: Nningning <wangningning14@huawei.com>1191724c
update zh-cn/application-dev/reference/apis/js-apis-wallpaper.md.
Signed-off-by: Nningning <wangningning14@huawei.com>