https://leetcode-cn.com/problems/same-tree/

    1. /**
    2.  * Definition for a binary tree node.
    3.  * class TreeNode {
    4.  *     val: number
    5.  *     left: TreeNode | null
    6.  *     right: TreeNode | null
    7.  *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
    8.  *         this.val = (val===undefined ? 0 : val)
    9.  *         this.left = (left===undefined ? null : left)
    10.  *         this.right = (right===undefined ? null : right)
    11.  *     }
    12.  * }
    13.  */
    15. function isSameTree(p: TreeNode | null, q: TreeNode | null): boolean {
    16.   if (p === null && q === null) return true;
    17.   if (p === null || q === null) return false;
    18.   if (p.val !== q.val) return false;
    19.   return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
    20. }

    https://bigfrontend.dev/zh/problem/virtual-dom-v-jsx-2