>[success] # 开闭原则 开闭原则的英文全称是 `Open Closed Principle`，简写为 `OCP`。它的英文描述是：`software entities (modules, classes, functions, etc.) should be open for extension , but closed for modification`。中文意思：**软件实体（模块、类、方法等）应该“对扩展开放、对修改关闭”**。