表格中的水平線来自文章文件類但在beamer中不可见

可能重複這个，所以，不要upvote：

完整解決方案：

\documentclass[xcolor=table]{beamer}
 \usepackage{hhline}
\makeatletter
\let\zz\[email protected]
\def\[email protected]{\kern\[email protected]\zz}
\makeatother
  \usepackage{multirow}
 \usepackage{booktabs}
 \definecolor{Aliceblue}{rgb}{0.94, 0.97, 1.0}
\definecolor{aliceblue}{rgb}{0.94, 0.97, 1.0}
\definecolor{babyblue}{rgb}{0.54, 0.81, 0.94}
 \begin{document}
\begin{frame}
  \begin{table}[ht]
\centering
\setlength\arrayrulewidth{1.3pt}
\footnotesize\setlength{\tabcolsep}{2.7 pt}
\renewcommand{\arraystretch}{1.4}
\begin{tabular}{|c|c|c|c|c|c|c|}
    \hline
    \cellcolor{aliceblue}  & \multicolumn{2}{c|}{\cellcolor{babyblue}ISE} & \multicolumn{2}{c|}{\cellcolor{babyblue}IAE} & \multicolumn{2}{c|}{\cellcolor{babyblue}ITAE} \\ 
    \hhline{|>{\arrayrulecolor{aliceblue}}->{\arrayrulecolor{black}}|-|-|-|-|-|-|} % <==========================================
    \multirow{-2}{*}{\cellcolor{aliceblue}Methods}
    & \cellcolor{aliceblue}-20\%       & \cellcolor{aliceblue}+20\%     & \cellcolor{aliceblue}-20\%        & \cellcolor{aliceblue}+20\%      & \cellcolor{aliceblue}-20\%       & \cellcolor{aliceblue}+20\%        \\ \hhline{-|*6-}
    \rowcolor{babyblue}ABC                                                           & 0.5645      & 0.63     & 1.8       & 1.8      & 6.1       & 6.6       \\ \hhline{-|*6-}
    \rowcolor{aliceblue}XYZ                                                            & 2.1       & 2.3      & 0.881       & 9.82      & 9.2       & 28.9       \\ \hhline{-|*6-}
    \rowcolor{babyblue}MNO                                                                & 0.68      & 0.97     & 1.62       & 1.61      & 8.9       & 8.2       \\ \hhline{-|*6-}
    \rowcolor{aliceblue} PQR                                                                 & 0.65       & 0.753     & 2.064       & 2.231      & 28.04       & 28.56       \\ \hhline{-|*6-}
\end{tabular}
\end{table}
\end{frame}
\end{document}