关于javascript:零基础小白从入门到实战之初识类和对象

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微服务:其实 kafka,redis, 微服务是买的三本书,这三本书作为明年的第一实现工作吧!刚开始学编程不久,据说过什么是设计模式
由很长时间的编程教训,本人写了很多代码,其中用到了设计模式,然而本人却不晓得学习过了设计模式,发现自己曾经在应用了,并且发现了一些新的模式挺好用的
浏览了很多他人写的源码和框架,在其中看到他人设计模式,并且可能体会设计模式的精妙和带来的益处。代码写着写着,字节都没有意识到应用了设计模式,并且纯熟的写了进去。
设计模式介绍
设计模式是程序员再面对同类软件工程设计问题所总结进去的有用的教训,模式不是代码,而是 某类问题的通用解决方案,设计模式 (Design pattern) 代表了最佳的实际。这些解决方案是泛滥软件开发人员通过相当长的工夫的试验和谬误总结进去的。设计模式的实质进步软件的维护性,通用性和扩展性,并升高软件的复杂度。
设计模式分为三种类型,共 23 种
创立型模式:单例模式,形象工厂模式,原型模式,建造者模式,工程模式。
结构型模式:适配器模式,桥接模式,装璜模式,组合模式,外观模式,享元模式,代理模式
行为型模式:模块办法模式,命令模式,访问者模式,迭代模式,观察者模式,中介者模式,备忘录模式,解释器模式 (Interpreter 模式),状态模式,策略模式,职责链模式(责任链模式)
留神: 不同的书籍上对分类和名称略有差异。
单例模式
单例模式介绍
? 所谓类的单例设计模式,就是采取肯定的办法保障再整个的软件系统中,对某个类只能存在一个对象实例,并且该类只提供了一个获得对象实例的办法(静态方法)。
? 比方 Hibernate 的 SessionFactory,他充当数据存储源的代理,并负责创立 Session 对象。SessionFactory 并不是轻量级的,个别状况下,一个我的项目通常只须要一个 SessionFactoury 就够,这是就会用到单例模式。
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