laywhx

A1
@echo off
set str=I love,bbs;bathome.net
for %%l in (%str%) do echo %%l
pause

A2
@echo off
set str=I love,bbs;bathome.net
for %%l in (%str%) do cls&echo %%l
pause
(如果知识答题的话这个应该算是最佳答案了)

@echo off
set str=I love,bbs;bathome.net
for %%l in (%str%) do if %%l==cn echo %%l
pause
(这个的可扩展性好)