Find the median of two positive arrays

Given two sizes, they are m and n Positive order of （ From small to large ） Array nums1 and nums2. Please find and return the values of these two positive ordered arrays Median .

example ： Input ：nums1 = [1,3], nums2 = [2], Output ：2.00000

Their thinking ：

1. Splice and sort the two arrays

2. Median judgment

var findMedianSortedArrays = function (nums1, nums2) {
            let nums3 = nums1.concat(nums2);
            let sum = nums3.length / 2;
            nums3.sort((a, b) => a - b);
            if (nums3.length % 2 !== 0) {
                return parseFloat(nums3[Math.floor(sum)]);
            } else {
                return parseFloat((nums3[sum] + nums3[sum - 1]) / 2);
            }
};