如何在数组javascript中找到需要求和才能得到给定总和的项

function findSumItems(arr, targetSum) {
  let index1, index2;

  for (let i = 0; i < arr.length; i++) {
    for (let j = i + 1; j < arr.length; j++) {
      if (arr[i] + arr[j] === targetSum) {
        index1 = i;
        index2 = j;
        break;
      }
    }
    if (index1 !== undefined && index2 !== undefined) {
      break;
    }
  }

  if (index1 !== undefined && index2 !== undefined) {
    console.log("需要求和才能得到给定总和的项为：" + arr[index1] + " 和 " + arr[index2]);
  } else {
    console.log("未找到需要求和才能得到给定总和的项");
  }
}

const arr = [1, 2, 3, 4, 5];
const targetSum = 7;

findSumItems(arr, targetSum);