比较两个文件夹的内容 通常用来检查拷贝文件是否完全 简单查看缺失和大小异常的文件 为了提高速度,对单个文件不进行hash比较 仅仅比较大小-Compare two folders contents of copies of documents are usually used to check whether the simple view completely missing and the size of anomalies in order to improve the s