如果最后一个元素是行中的最后一个元素，则将其居中

function centerLastElement(array) {
  const lastIndex = array.length - 1;
  const middleIndex = Math.floor((array.length - 1) / 2);

  if (middleIndex < lastIndex) {
    const temp = array[middleIndex];
    array[middleIndex] = array[lastIndex];
    array[lastIndex] = temp;
  }

  return array;
}

const array = [1, 2, 3, 4, 5];
const centeredArray = centerLastElement(array);
console.log(centeredArray);