二叉树生成及遍历。以某种形式建立二叉树逻辑结构信息，建立二叉链表，先作先序、中序、后序遍历，将二叉树中序线索化，中序遍历线索二叉树-Tree generation and traversal. Some form of information to establish the logical structure tree, the establishment of binary list, to make the first order, in sequence, after the trave