# 设计模式原则

- [单一职责原则](https://haoqinn.gitbook.io/handbook-of-design-pattern/she-ji-mo-shi-yuan-ze/dan-yi-zhi-ze-yuan-ze.md): 单一职原则 SRP「Single responsibility principle」：就一个类而言，应该仅有一个引起它变化的原因。修改代码总是一件危险的事情，特别是当两个职责耦合在一起的时候，一个职责发生变化可能会影响到其他职责的实现，造成意想不到的破坏。因此一个对象（方法）只做一件事情
- [最少知识原则](https://haoqinn.gitbook.io/handbook-of-design-pattern/she-ji-mo-shi-yuan-ze/zui-shao-zhi-shi-yuan-ze.md): 最少知识原则 LKP「Least Knowledge Principle」说的是一个软件实体应当尽可能少地与其他实体发生相互作用。这里的软件实体是一个广义的概念，不仅包括对象，还包括系统、类、模块、函数、变量等。
- [开放封闭原则](https://haoqinn.gitbook.io/handbook-of-design-pattern/she-ji-mo-shi-yuan-ze/untitled-4.md): 开放封闭原则 OCP 「Open Closed Principle」, 它的定义如下，软件实体「类、模块、函数」等应该是可以扩展的，但是不可以修改


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