详细帮助参考：set/?cmd/?务必仔细看！

具体应用：

1、获取变量子字符串：echo%date:~0,4%%date:~5,2%%date:~-2,2%%time:~0,2%%time:~3,2%%time:~6,2%

2、变量内容替换：setstr=000111000&&echo%str:000=222%&&echo%date:-=%%time::=%

3、延迟变量环境扩展：cmd/v:on

set/aj=0

for/l%iin(1,1,10)doset/aj=!j!+%i