通过 Infinity 和 -Infinity 查找数组中最大和最小值

function findMaxNum(numbers) {
  let max = -Infinity;
  for (const n of numbers) {
    if (n > max) {
      max = n;
    }
  }
  return max;
}

function findMinNum(numbers) {
  let min = Infinity;
  for (const n of numbers) {
    if (n < min) {
      min = n;
    }
  }
  return min;
}