Tabularx: 自定义\hrule超出\textwidth的原因？

Question

关于为什么我的自我配置超出了我的页面布局的\hrule规定，有什么想法吗？\textwidth

---

最小工作示例（MWE）：

\documentclass{article}
\usepackage{xcolor,colortbl}
\usepackage{tabularx}

\makeatletter
    \newcommand{\thickline}{%
        \noalign {\ifnum 0=`}\fi \color{red}\hrule height 5pt
        \futurelet \reserved@a \@xhline
    }
\makeatother

\begin{document}
\begin{tabularx}{\textwidth}{ll}
    test & test \\\thickline
    test & test \\
\end{tabularx}
\end{document}

Answer 1

article，如果您没有另行定义，则以缩进开始段落（例外情况是紧接在章节标题之后的段落）。 可以通过以下方式删除：

• 在环境\noindent之前立即添加tabularx
• 将环境封闭tabularx在浮动环境中table

• 将其封闭在center环境中

  \documentclass{article}
  \usepackage[table]{xcolor} % loads 'colortbl' automatically
  \usepackage{tabularx}
  
  \makeatletter
      \newcommand{\thickline}{%
          \noalign {\ifnum 0=`}\fi \color{red}\hrule height 5pt
          \futurelet \reserved@a \@xhline
      }
  \makeatother
  
  %---------------- show page layout. don't use in a real document!
  \usepackage{showframe}
  \renewcommand\ShowFrameLinethickness{0.15pt}
  \renewcommand*\ShowFrameColor{\color{red}}
  %---------------------------------------------------------------%
  
  \begin{document}
  \section{Tests}
  \begin{tabularx}{\textwidth}{lX}
      test & test \\\thickline
      test & test \\
  \end{tabularx}
  
  \noindent
  \begin{tabularx}{\textwidth}{lX}
      test & test \\\thickline
      test & test \\
  \end{tabularx}
  
  \bigskip
  or
  
  \begin{table}[htb]
  \begin{tabularx}{\textwidth}{lX}
      test & test \\\thickline
      test & test \\
  \end{tabularx}
  \end{table}
  
  or
  
  \begin{center}
  \begin{tabularx}{\textwidth}{lX}
      test & test \\\thickline
      test & test \\
  \end{tabularx}
  \end{center}
  
  \end{document}