js 数组补位数据（a-z)超出补数字

function arrAddAZ(num){
    let arr = []
    let sumArr = []
    for(let i = 97;i<=122;i++){
        arr.push(String.fromCharCode(i))
    }
    if(num<=26){
        for(let y = 0;y<=num-1;y++){
            sumArr.push(arr[y])
        }
        return sumArr
    }
    let arrnum = 0
    let cha = parseInt(num/26)
    let remain = num-(cha*26)
    recursion(arrnum,cha,remain,arr,sumArr)
    return sumArr  
}
function recursion(arrnum,cha,remain,arr,sumArr){
    let indexs = arrnum
    if(arrnum>cha-1 && remain >0){
        for(let y = 0;y<=remain;y++){
            sumArr.push(arr[y]+indexs)
        }
        return sumArr
    }
    if(arrnum>cha-1){
        return sumArr
    }
    
    for(let y = 0;y<=arr.length-1;y++){
        sumArr.push(indexs?arr[y]+indexs:arr[y])
    }
    indexs = indexs+1
    recursion(indexs,cha,remain,arr,sumArr)
    
}

 arrAddAZ(33)