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Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~女主角Piengdau是时尚界名人，当她对爱情绝望之后，便全身心投入到工作当中，直到有一天遇到了她的真命天子Orm。Orm是一位帅气的摄影师，两人在时尚杂志编辑Tael与化妆师Woo的撮合下，展开了一段地下恋情。外表清纯，内心狠毒的女孩，她用诡计拉拢化妆师Kob姨，并使Kob姨变成了Piengdau的死对头。随后，Kob姨和Deenee一起不择手段地对付Piengdau，甚至连她身边的朋友也一同受到牵连。最终，Deenee一跃成为名模。西九龙冲锋队女警长吕霏侠因职业问题已吓跑数名男友，所以她向现任男友董兆良谎称自己是一位公关，由于已认定对方为结婚对象，霏侠决定在拍拖一周年纪念日向兆良坦白身分。霏侠赴兆良约会途中遇劫案，对贼人穷追不舍，终于把贼人制服，却发现手执气球及戒指的兆良目睹她捉贼的过程，原本打算向女友求婚的兆良呆住，霏侠亦只好继续执行职务……这部剧讲的是一个跨越200年的纯爱故事，男主角为了守护女主角不惜挑战危险的命运。People have studied SYN attack prevention technology earlier. To sum up, there are mainly two categories, one is through firewall, router and other filter gateway protection, the other is through strengthening TCP/IP protocol stack protection. However, it must be clear that SYN attacks cannot be completely prevented. What we have done is to reduce the harm of SYN attacks as much as possible unless TCP protocol is redesigned.The traditional way: