有时需要测试2 个数据结构的同构性，即2个同构的结构在相应的位置具有相同结点数 和分枝数。试设计一个递归函数用于测试2 棵二叉树是否同构。-Sometimes need to test two data structure isomorphism, ie isomorphism of two structures in the corresponding location with the same number of nodes and branches. Test the design