ts 联合类型
ts 联合类型
参考:https://www.jianshu.com/p/655a6471f50f
指多个类型的合并类型
1. 基础类型联合
let a: string | number; a = 1; //ok a= "a"//ok
2. 对象类型联合
对象联合类型只能访问联合中所有共同成员
interface Women{ age: number, sex: string, cry(): void } interface Man{ age: number, sex: string, } declare function People(): Women | Man; let people = People(); people.age = 18; //ok people.cry();//error 非共同成员