4. 寻找两个正序数组的中位数

    var findMedianSortedArrays = function (nums1, nums2) {
      let a = nums1.concat(nums2).sort((a, b) => a - b)
      console.log(a);
      let len = a.length
      let res = len % 2 == 0 ? [len / 2 - 1, len / 2] : Math.floor(len / 2)
      return typeof res == 'number' ? (a[res]).toFixed(5) : ((a[res[0]] + a[res[1]]) / 2).toFixed(5)
    };
    console.log(findMedianSortedArrays([0], [0, 0, 0]));