说明：  同时也是很方便的工具：在资源浏览器右键菜单里添加“如果此文件夹为空,则删除它”项，对于文件夹，如果选中此项，则判断该文件夹是否为空，如果为空则删掉它，否则提示文件夹不为空。可以避免手工清理空文件夹时误将非空文件夹删除
(Is also very handy tool: In Explorer right-click menu to add, If this folder is empty, delete it item, for folders, if this option is selected, it is determined whether the folder is empty, if empty then delete it, otherwise prompt the folder is not empty. Avoid manually clean up empty folders when a non-empty folders deleted by mistake)