# Functions
递归构建目录树,插入指定目录下的所有文件
parent 父目录的file_id
path 指定的目录
parentPassword 父目录所携带的密码
drive 要构建的盘
*/.
build tree.
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重建指定路径与深度的目录树: 先删除该目录与该目录下所有文件的model，再重新插入.
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