这是一个遍历树的深度的小程序，并且还可以添加数据扩展这个树的深度，通过这个小程序来体验一下什么是树吧，之后就会豁然开朗拉-This is a depth of the tree traversal of small procedures, and also can add data to expand the depth of the tree. Through this small procedure to experience what it is a tree and then will