主要由两大功能组合完成：文件上载和文件删除，文件上载过程中可以任意更改文件名，甚至是文件的后缀，如果服务器上存在一个和你上传的文件名相同的文件，那么服务器上的文件将被你所上传的文件覆盖，可以查找并显现出指定目录下的所有文件，并可对这些文件进行单个或批量的删除-Mainly by the combination of two functions complete: file upload and delete files, file upload process can arbitrarily change the file name, file extension and even if there is a file name and you uploaded the same file on the server, the file on the server will be overwritten files you upload, you can find and show all the files in the specified directory, and these files single or batch delete