关于typescript:TS中Omit-Pick-Exclude区别关系

type T1 = {
a: ‘a’,
b: ‘b’,
}

type T2 = ‘a’ | ‘b’

type p3 = Omit<T1, ‘a’> // {b: ‘b’}
type p6 = Pick<T1, Exclude<T2, ‘a’>> // {b: ‘b’}

type P4 = Exclude<T2, ‘a’> // ‘b’

type p5 = Pick<T1, ‘a’> // {a: ‘a’}