TypeScript常见问题汇总

理解 type Record<K extends keyof any, T> = { [P in K]: T; }

// type KEY = keyof any //即 string | number | symbol
type Record<K extends keyof any, T> = {
    // [P in K]的意思是对象的key可以取 string，number，symbol.
    [P in K]: T;
};
// 规定对象类型 key 为 string， value 为 boolean
type Classes = Record<string, boolean>