如何查找数组中第二大值的索引

function findSecondMaxIndex(arr) {
  let maxIndex = 0;
  let secondMaxIndex = -1;

  for (let i = 1; i < arr.length; i++) {
    if (arr[i] > arr[maxIndex]) {
      secondMaxIndex = maxIndex;
      maxIndex = i;
    } else if (arr[i] < arr[maxIndex]) {
      if (secondMaxIndex === -1 || arr[i] > arr[secondMaxIndex]) {
        secondMaxIndex = i;
      }
    }
  }

  return secondMaxIndex;
}

const array = [1, 5, 3, 2, 4];
const secondMaxIndex = findSecondMaxIndex(array);
console.log("第二大值的索引为：" + secondMaxIndex);