Accept immediately calls the visit method on the visitor, passing the node as a parameter.
accept直接对访问器调用visit方法，并把节点作为参数传递。
Visit-node takes a list of visitor functions, each with a signature (fn [node state]) that returns a context map, which can contain the keys: node, : state, : stop, or: jump.
visit - node获取一个访问者函数列表，其中每个函数都有一个返回上下文映射的签名(fn [nodestate])，上下文映射中可能包含键：node、： state、：stop或：jump。
The primary difference in tree-visitor is that the visit-node function returns several items: a new-node, a new-state, and a stop flag.
tree-visitor中的主要差别在于，visit-node函数返回多个项目：一个 new-node、一个new-state和一个 stop 标记。
User specified nodes as a starting point, the output of each node traversal visit Spanning Tree sequence and the corresponding set of edges.
以用户指定的节点为起点，分别输出每种遍历下的节点访问序列和相应生成树的边集。- one。
User specified nodes as a starting point, the output of each node traversal visit Spanning Tree sequence and the corresponding set of edges.
以用户指定的节点为起点，分别输出每种遍历下的节点访问序列和相应生成树的边集。- one。
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