为什么我没有得到该表的正确边框？
这是我的代码：
\begin{table}[htbp]
%\extrarowsep=_3pt^3pt
\begin{tabu}to\linewidth{|[2pt gray]l|c|c|c|[1.5pt gray]}
\tabucline[1.5pt gray]-
\bfseries something & \multicolumn{3}{c|}{something} \\
\tabucline[1.5pt gray]-
\textbf{something} & \textbf{something} & \textbf{something} & \textbf{something} \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
\end{tabu}%
\caption{something}
\label{tab:something}%
\end{table}%
答案1
你需要
\multicolumn{3}{c|[1.5pt gray]}{something}
|即您必须在命令中重复最后一条语句的宽度，否则将使用\multicolumn标准宽度！|
\multicolumntabu是一个“特殊”命令，它否决了（或）中所做的列规范——如果没有明确强制这样做，tabular它就不会使用该规范。|[1.5pt gray]
另外：线条实在是太多了！
完整示例：
\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{tabu}
\begin{document}
\begin{table}[htbp]
\centering
%\extrarowsep=_3pt^3pt
\begin{tabu}to\linewidth{|[2pt gray]l|c|c|c|[1.5pt gray]}
\tabucline[1.5pt gray]-
\bfseries something & \multicolumn{3}{c|[1.5pt gray]}{something} \\
\tabucline[1.5pt gray]-
\textbf{something} & \textbf{something} & \textbf{something} & \textbf{something} \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
something & something & something & something \\
\hline
\tabucline[1.5pt gray]-
\end{tabu}%
\caption{something}
\label{tab:something}%
\end{table}%
\end{document}
