如何获得2个数组的和

function sumArrays(arr1, arr2) {
  if (arr1.length !== arr2.length) {
    // 如果两个数组长度不同，进行补零操作
    const maxLength = Math.max(arr1.length, arr2.length);
    arr1 = arr1.concat(Array(maxLength - arr1.length).fill(0));
    arr2 = arr2.concat(Array(maxLength - arr2.length).fill(0));
  }

  const sum = [];
  for (let i = 0; i < arr1.length; i++) {
    sum.push(arr1[i] + arr2[i]);
  }

  return sum;
}

const array1 = [1, 2, 3];
const array2 = [4, 5, 6];
const result = sumArrays(array1, array2);
console.log(result); // 输出 [5, 7, 9]