SOURCE

// 牌底 => 牌顶
// [] [5, 4, 3, 2, 1]
// [1] [2, 5, 4, 3]
// [3, 1] [4, 2, 5]
// [5, 3, 1] [2, 4]
// [4, 5, 3, 1] [2]
// [2, 4, 5, 3, 1]

const fn = (arr) => {
    let res = []
    while(arr.length){
        const item = arr.shift()
        if(res.length >= 2){
            const first = res.shift()
            res.push(first)
        }
        res.push(item)
        console.log(res)
    }
    return res
}

console.log(fn([2, 4, 5, 3, 1]))