娜一抹惊鸿
娜一抹惊鸿
``` // 1 type User = { id: number; kind: string; } function makeCustomer(u: T): T { return { // ...u, id: u.id, kind: 'customer' } } makeCustomer({ id: 1,...
``` // 2 函数重载 type CustomType = string | number; function f(a: number, b: number): number; function f(a: string, b: string): string; function f(a: number | string, b: number |...