递归函数为自调用函数，在函数体内直接或间接自己调用自己，但需要设置自调用的条件，若满足条件，则调用函数本身，若不满足则终止本函数的自调用，然后把目前流程的主控权交回给上一层函数来执行。
我们来看一个经典的递归删除函数
函数的作用：删除目录下面的所有文件，并删除目录
函数代码：
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