章节和小节的格式

Question 1

如果您使用的是标准文档类，调整章节标题外观的常用方法是使用 titlesec 包。我在下面提供了或多或少符合您要求的代码，并添加了注释，以便您了解每个代码的作用。

\documentclass{article}

% load the package; make centered titles default
\usepackage[center]{titlesec}

% use Roman numerals for sections
\renewcommand{\thesection}{\Roman{section}}

% use Arabic numerals for subsections
\renewcommand{\thesubsection}{\arabic{subsection}}

% use letters for subsubsections with a parenthesis
\renewcommand{\thesubsubsection}{\alph{subsubsection})}

% put a period and space after numbers
\titlelabel{\thetitle.\thickspace}

% Make section titles centered and bold
\titleformat*{\section}{\centering\bfseries}

% Make subsections centered and italc
\titleformat*{\subsection}{\centering\itshape}

% Make subsubsections centered
\titleformat*{\subsubsection}{\centering}

\usepackage{lipsum}% provides dummy text; not needed for solution

\begin{document}

\section{This is a Headline}

\lipsum[1][1-4]

\lipsum[1][5-6]

\subsection{This is a Subheadline}

\lipsum[2][1-4]

\lipsum[2][5-8]

\subsubsection{This is a Subsubheadline}

\lipsum[3][1-5]

\lipsum[3][6-8]

\end{document}

该软件包还提供了更复杂的命令。请参阅其文档。

我还注意到，在您的示例中，标题后的第一个段落仍然缩进，这与 LaTeX 的正常行为不同。该软件包还允许您更改该行为。您可以将其添加到序言中：

% change spacing: not using * means indentation will not be
% suppressed
\titlespacing{\section}{0pt}{*4}{*1.5}
\titlespacing{\subsection}{0pt}{*4}{*1.5}
\titlespacing{\subsubsection}{0pt}{*4}{*1.5}

产量：

再次，文档中有更多详细信息。

编辑：我刚刚注意到，在你原来的小节中，句号在括号之前。这让事情变得复杂，因为你不能\titlelabel一致地使用。在这种情况下，你必须使用没有星号的版本，\titleformat它提供了更细粒度的控制：

\documentclass{article}

\usepackage[center]{titlesec}

% use Roman numerals for sections
\renewcommand{\thesection}{\Roman{section}}

% use Arabic numerals for subsections
\renewcommand{\thesubsection}{\arabic{subsection}}

% use letters for subsubsections with a parenthesis
\renewcommand{\thesubsubsection}{\alph{subsubsection}}

% Make section titles centered and bold
\titleformat%
    {\section}% command to format
    [block]% overall shape: see documentation
    {\centering\bfseries}% formatting applie to whole thing
    {\thesection.}% format of number label
    {0.5em}% spacing between number label and title
    {}% additional code before title

\titleformat%
    {\subsection}% command to format
    [block]% overall shape: see documentation
    {\centering\itshape}% formatting applie to whole thing
    {\thesubsection.}% format of number label
    {0.5em}% spacing between number label and title
    {}% additional code before title

\titleformat%
    {\subsubsection}% command to format
    [block]% overall shape: see documentation
    {\centering}% formatting applie to whole thing
    {\thesubsubsection.)}% format of number label
    {0.5em}% spacing between number label and title
    {}% additional code before title

\usepackage{lipsum}% provides dummy text; not needed for solution

% change spacing: not using * means indentation will not be
% suppressed
\titlespacing{\section}{0pt}{*4}{*1.5}
\titlespacing{\subsection}{0pt}{*4}{*1.5}
\titlespacing{\subsubsection}{0pt}{*4}{*1.5}

\begin{document}

\section{This is a Headline}

\lipsum[1][1-4]

\lipsum[1][5-6]

\subsection{This is a Subheadline}

\lipsum[2][1-4]

\lipsum[2][5-8]

\subsubsection{This is a Subsubheadline}

\lipsum[3][1-5]

\lipsum[3][6-8]

\end{document}

Answer