The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu
(2). AddEventListener () and attachEvent ():
这样的环境下，来者分田的政策不得不叫停，新垦的田地由徽王府控制买卖，更多来投的流民投入到了其它行业之中，年轻科举合格者则由徽王府出资深造。
书儿听了，惊得拿手捂住嘴儿道：少爷也不说给我一声儿。
Let's take a look at tobacco shreds. When we open them, we will find that this is not actually made of traditional tobacco leaves. It is really fragrant and soft and feels humid. It should be made of some special material after soaking.
Analysis: JS floating-point number operation cannot accurately express decimals. When will it be accurate? I don't know (-).
本剧改编自Audrey Niffenegger的同名小说，讲述Clare及Henry之间复杂、科幻的爱情故事。
Continue with the above example
1, Chengyan Sichuan secret base materials, soup, auxiliary materials, fresh food materials, raw materials centralized collection and supply, quality assurance.
三个家庭每天都要面对各种新的问题与困扰，彼此往来间也不可避免的产生了一些不愉快。不过只要抱持着积极乐观的心态，难题总会迎刃而解，欢乐的生活也依旧会继续。
1944年末，日伪秋季扫荡和叛徒出卖使得白城陷入艰难。江满根和地下党员彭秀女临危受命进入白城。满根毫无地下斗争经验，鲁莽冲动，行动不断脱离组织计划，引起日本人和伪警察局长楚强的怀疑，并害死了秀女。为了完成任务，他只得求助仇人、父亲当年好友——伪县长廖一清。原来白城失陷时，时任城防司令的江父决定牺牲自己，让廖假投降以保百姓安全。在廖帮助下，满根与当地各种势力建立了联系，并利用土匪等势力另辟蹊径完成了各项任务，建立了白城交通站。日军投降后，满根开始策反廖一清，楚强和廖的女儿春晓的军统身份也随之浮出水面。廖一清要和平解放白城，楚强武力相逼，满根和春晓赶来营救，春晓为满根挡了子弹，楚强最终被满根击毙。满根回到部队，踏上解放全国的征程。
《张震讲故事》系列大电影，改编自上世纪九十年代起风靡全国高校的电台恐怖故事集“张震讲故事”，它在80后的高校学生群体中，有着不小的知名度。在宿舍里守着收音机听“张震讲故事”，越听越害怕，但又越来越上瘾，可谓是大家青春中不可磨灭的一段回忆。
User class unified interface, User1 and User2 are different objects respectively, and they are related. If the mediator mode is not adopted, the two need to hold references to each other, so the coupling degree between the two is very high. In order to decouple, the Mediator class is introduced to provide unified interface, and MyMediator is its implementation class, which holds instances of User1 and User2 to control User1 and User2. In this way, User1 and User2 objects are independent of each other. They only need to maintain a good relationship with the Mediator, and the rest is maintained by the MyMediator class! Basic implementation:
Flame retardant mechanism
BaiDuInterview.prototype = new Interview ();
6-Seed Semen
[Differences between Squat and Hard Pull Movements and Training in Strength Lifting and Weightlifting] [Reprint/Collection]
