以递归方式按先序序列建立二叉树的二叉链表结构，再分别输出先序、中序、后序的遍历结果-Recursively by first-order sequence of the establishment of a binary tree binary linked list structure, each with output of the first sequence, in order, postorder traversal of the results of

二叉树主要完成以下功能: 1. 建立二叉树 2. 计算结点所在的层次 3.统计结点数量(size)和叶结点数量 4.计算二叉树的高度 5.计算结点的度 6.找结点的双亲(Parent)和子女 7.二叉树的遍历 8.二叉树的输出-Main binary tree complete the following features: 1. The establishment of a binary tree. Calculate the junction point w