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inOrderTraverse中的callback参数的意义何在？

在学习排序二叉树的中序遍历时，有个疑惑。老师的代码中，在定义inOrderTraverse这个方法的时候，规定了要传入callback这个参数，但是后续代码中，却没有给这个参数传入具体的值。我自己重新写了代码，去掉了callback这个参数，代码无报错，且运行结果正确。所以我很疑惑，老师写的这个callback参数的意义在哪里呢？

03:47
qq_long妹_0

2018-05-16

源自：Javascript实现二叉树算法  1-6

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qq_慕神1420022
2022-03-30

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qq_long妹_0 提问者
2018-05-17

睡了一觉，自己悟出来了。传入的callback，实际上就是老师定义的callback函数，因为老师的callback函数是定义在binarytree外部的，所以他把这个函数传进去，以便后续调用。我自己的代码，把callback函数定义在binarytree内部了，所以我不传callback参数是没有任何问题的，但是我的callback函数在其它地方就无法调用了。

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