bat 判断命令是否执行成功
连接符形式，&& 表示成功，|| 表示失败，例如：
call xxx.bat && (goto succeed) || goto failed
:succeed
echo successfully
:failed
echo failed
pause
使用%errorlevel%
call xxx.bat
if %errorlevel% == 0 (
echo successfully
) else (
echo failed
)
call xxx.bat && (goto succeed) || goto failed
:succeed
echo successfully
:failed
echo failed
pause
call xxx.bat
if %errorlevel% == 0 (
echo successfully
) else (
echo failed
)