图像遍历树...两种方法实现，实用，方便，里面包含说明文件，以及方法描述-Image ... two ways to traverse the tree implementation, practical, convenient, which contains documentation, as well as the method of descr iption and so on

实现图的深度遍历 是一个深度优先算法 基于树的先跟遍历-Realize the depth chart is a depth-first traversal algorithm is based on the tree to begin with traversal