原本计划推出的「满 200 减 20」优惠因后台设置错误，被错误配置为「满 200 减 200」，导致用户仅需支付约 10 元运费即可获得原价 200 元以上的商品，引发大规模抢购。「豆瓣薅羊毛」话题随即登上微博热搜。
Александр Курбатов (редактор отдела «Бывший СССР»)
，更多细节参见夫子
Commutativity and associativity might sound the same, and indeed most commutative operations are also associative. But there are a few math operations that are only one or the other. Matrix multiplication, for example, is associative but not commutative Matrix multiplication - Wikipedia en.wikipedia.org/wiki/Matrix_multiplication#Non-commutativity . And surprisingly, floating point arithmetic — i.e. any math operator in JavaScript — is commutative but not associative Associative property - Wikipedia en.wikipedia.org/wiki/Associative_property#Nonassociativity_of_floating_point_calculation ! ↩，更多细节参见旺商聊官方下载
На помощь российским туристам на Ближнем Востоке ушли миллиарды рублей20:47