4. 寻找两个正序数组的中位数

/**
 * @param {number[]} nums1
 * @param {number[]} nums2
 * @return {number}
 */
var findMedianSortedArrays = function (nums1, nums2) {
  let median
  const num = [...nums1, ...nums2].sort((a, b) => a - b)
  num.length % 2 === 0 ? (median = (num[num.length / 2] + num[num.length / 2 - 1]) / 2) : (median = num[Math.floor(num.length / 2)])
  return median
}