10 怎样实现，可选择地无视或接受，父计数器的清零（重置）规则？

1.mwea在这里起的作用是？

2.是不是可以理解成，你希望:

• 假定在一些操作后计数器初始值cnt=5
• \cmd*带星号,不会自动清零(resume)，这将导致cnt=6
• \cmd*带星号,同样不会自动清零(resume)，这将导致cnt=7
• \cmd不带星号,自动清零，这将导致cnt=0清零之后自增cnt=1
• \cmd*带星号,不会自动清零(resume)，这将导致cnt=2 ?

3.该问题如果与beamer无关，则mwe最好用article或者book

version 1

\documentclass{beamer}
\newif\ifresume %<- add newif condition
\resumefalse
\newcommand{\separateline}[1]{%
    \hrulefill\ $\downarrow$ #1 $\downarrow$\ \hrulefill%
}
\newcounter{mwea}
\newcounter{mweb}
\newcommand{\mwea}{%
    \stepcounter{mwea}%
    \ifresume
        \setcounter{mweb}{1}%
    \fi
    cnt mwea's value is \themwea. \par%
}
\newcommand{\mweb}{%
    \stepcounter{mweb}%
    cnt mweb's value is \themweb. \par%
}
\begin{document}
\frame{
    
    \ttfamily\small

    \separateline{first layer}
    
    \mwea \mweb \mweb \mweb 

    \separateline{second layer}

    \mwea \mweb \mweb \mweb  

    \separateline{third layer}
    
    \mwea \mweb \mweb \mweb  

    \resumetrue%<- change the condition
    \separateline{fourth layer}

    \mwea \mweb \mweb \mweb 

}
\end{document}

version 2

\documentclass{beamer}
\newcommand{\separateline}[1]{%
    \hrulefill\ $\downarrow$ #1 $\downarrow$\ \hrulefill%
}
\newcounter{mwea}
\newcounter{mweb}
\NewDocumentCommand{\mwea}{s}{%
    \stepcounter{mwea}%
    \IfBooleanF{#1}{\setcounter{mweb}{1}}%
    cnt mwea's value is \themwea. \par%
}
\newcommand{\mweb}{%
    \stepcounter{mweb}%
    cnt mweb's value is \themweb. \par%
}
\begin{document}
\frame{
    \ttfamily\small

    \separateline{first layer}
    
    \mwea* \mweb \mweb \mweb 

    \separateline{second layer}

    \mwea* \mweb \mweb \mweb  

    \separateline{third layer}
    
    \mwea \mweb \mweb \mweb  %<- clear the mweb here

    \separateline{fourth layer}

    \mwea* \mweb \mweb \mweb 
}
\end{document}