SOURCE

let a = '2022-1-3'
let b = '2022-1-2'


let days = 2
let type = 1
if(type === 1){
    days = -days // type Number 0.全部，1.之前，2.之内
}
console.log(moment(b))
console.log(moment(a).add(-1 * days, 'days').toDate())
console.log( moment(b).toDate() >=   moment(a).add(days, 'days').toDate()  )