SOURCE

let v = 0
function test() {
    return new Promise(function (resolve, reject) {
        if (v > 0) {
            resolve('aaa')
        } else {
            reject('bbb')
        }
    })
}
let aaa = test()
console.log(aaa)
aaa.then(res => {
    console.log(res)
})



let sarr = [
    1,2,3,4,5,6,7,8,9,10
]
function atest(arr, aa) {
    let newArr = []
    let num = aa
    for (let i = 0; i < arr.length; i++) {
      if (i < num) {
        newArr.push(arr[i])
      } else {
        let longitude = 0
        for (let j = 0; j <= num; j++) {
           // console.log(arr[i-j])
          longitude += arr[i-j]
        }
        newArr.push(longitude)
      }
    }
    console.log(newArr)
    return newArr
}

atest(sarr, 4)