一级理论和二级理论的区别

Create the 'ProductService' class under Packge 'service':说不上三句话，板栗和葫芦就得知：郑家和赵家从南华门进城后，在德胜路被一个人蓄意冲撞，惊了马，翻了一辆人坐马车，郑长河和赵三从车上跌了下来，还翻了三辆货车。清末，威名远播的镇远镖局四位镖头接到一神秘托镖人的委托押送五千两黄金。然而，托镖人离开镖局后便遇袭重伤，临死交代若五十年后，黄金无人认领，便归四镖头所有。数年后，依然无人领取黄金，四位镖头遂以一枚图章作为凭证，将图章分为四份，各占其一，日后只要将图章合并，便可平分黄金……多年，镇远镖局得独子。从家父被绑架，肩起护镖枷锁，等待永不出现得领镖人。 　　旧地重游，在山重遇指腹为婚得妻子莫亦儿。两人相见不相识，发展一段可歌可泣得苦恋...In the termination phase of tcp connection, the connection between the client and the server is usually cut off through four interactions of messages with fin flags. However, when one of the clients or servers has abnormal conditions and cannot normally complete four tcp waves to terminate the connection, RST messages will be used to forcibly interrupt the connection.　　然而，不愉快的事件陆续发生。美凤遭同学Johnny拍下色 情录像带、凌浩才为替美凤出头却惨遭打死。身为他们首领的陈勇愤怒地将Johnny打得重伤，以致自己再度入狱。Code as above; Write three functions of order500, order200 and orderNormal respectively, and process their own business logic in the functions respectively. If their own functions cannot be processed, they will return the string nextSuccessor to pass it back, then encapsulate the constructor Chain, pass an object fn into it, and have their own attribute Successor. There are two methods setNextSuccessor and passRequest on the prototype. The method setNextSuccessor specifies the order of nodes in the responsibility chain, and saves the corresponding method to the attribute this.Successor, chainOrder500. SetNextSuccessor (chainOrder200); ChainOrder200. SetNextSuccessor (chainOrderNormal); Specifies the order in the chain, so this.Successor references the order200 method and the orderNormal method, so if chainOrder500.passRequest (1, true, 500) is called for the first time, the order500 method is called, output directly, and chainOrder500.passRequ is called for the second time.