The basic page is displayed as follows:

As can be seen from the above picture, this is a process for each file. It is a function similar to a network disk to save uploads and downloads. In this network disk, files can be created, opened, copied, deleted, uploaded and downloaded. Each execution will operate the database and modify the database information accordingly. The display page is also through The database query is traversed, and the next step is the operation and detailed explanation of the specific code