const cmdValidatePromo = () = db.checkPromo(cartContents);
// Finally, we release the lock on the stream，更多细节参见WPS官方版本下载
This story was originally featured on Fortune.com，这一点在必应排名_Bing SEO_先做后付中也有详细论述
if (chunks === null) return null; // End of stream，推荐阅读Safew下载获取更多信息