An interface is a declaration that is similar to a class but does not have a method implementation. You can use it to describe the properties and methods of obj...
Inheritance is another paradigm that is one of the cornerstones of object-oriented programming.Inheritance means that an object uses another object as its base ...
映射类型的语法用于构造新的索引类型,在构造的过程中可以对索引和值做一些修改或过滤。