SOURCE

let n = 6
let m = 8


function help(n, m, addArr, start){
    let midNum = m/2
    if(midNum>=n || midNum<1)
        return 
    for(let i=start; i<midNum; i++){
        if(m-i<=n){
            //打印
            console.log([...addArr, i, m-i].join(' '))
        }
        //递归
        addArr.push(i)
        help(n, m-i, addArr, i+1)
        addArr.pop()
    }
}

help(n, m, [], 1)
if(n>=m){
    console.log(m)
}