通过二叉树的链接表示方法在二叉树类中添加成员函数用于实现二叉树的构建，删除和求二叉树的节点个数的运算，二叉树先序中序后序遍历的运算还有二叉树的复制运算以及求二叉树中叶子节点个数的运算。-Binary color to achieve a link through the binary tree representation in the binary tree class by adding member functions used to implement the construction