ctexart如何搬scrartcl.cls中的轮子\captionaboveof{}{}？

\documentclass[UTF8]{ctexart}
\usepackage{tabularx,fancyvrb}
\usepackage[margin=1cm,papersize={21cm,14.85cm}]{geometry}%\geometry{showframe}
\pagestyle{empty}
\newcommand*\cs[1]{\texttt{\textbackslash#1}}
\newcommand\B{Some nonsense text which fills at least one line of a tabular called nonsense tabular with text. }
\begin{document}
\begin{Verbatim}[frame=lines]
\captionaboveof{table}{Hello.}
\begin{tabularx}{\linewidth}{@{} lX @{}}
left column & \B\\
l           & \B\\
left column & \B\\
l           & \B\\
left column & \B\\
l           & \B\\
left column & \B\\
l           & \B\\
left column & \B\\
l           & \B\\
left column & \B\\
l           & \B\\
left column & \B\\
l           & \B\\
\end{tabularx}
\end{Verbatim}

% \captionaboveof{table}{Hello.}
\begin{center}
    \begin{tabularx}{\linewidth}{@{} lX @{}}
    left column & \B\\
    l           & \B\\
    left column & \B\\
    l           & \B\\
    left column & \B\\
    l           & \B\\
    left column & \B\\
    l           & \B\\
    left column & \B\\
    l           & \B\\
    left column & \B\\
    l           & \B\\
    left column & \B\\
    l           & \B\\
    \end{tabularx}
\end{center}

\end{document}

参考资料：

scrartcl.cls

xltabular-doc.tex

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