把d:\org\及子文件夹的png文件复制到 d:\dist，不带目录,最后的/y表示强制覆盖不询问
for /r "d:\org" %f in (*.txt) do @xcopy "%f" "d:\dist\" /f/y
把d:\org\及子文件夹的png文件复制到 d:\dist，附带目录
xcopy "d:\org\*.png" "d:\dist\" /s