我想制作一个像下面给出的模板一样的花式章节

Question

我想制作一个像下面给出的模板一样的花式章节

% Here is what I tried
\documentclass[a4paper, 11pt,oneside]{book}
\usepackage{tikz}
\usepackage{xcolor}
\usepackage{titlesec}
\titleformat{\chapter}[display]{\bfseries}{\Large\chaptername~\thechapter\endgraf%
    \tikz\draw[very thick,fill=black] (0,0) rectangle (3.5,-0.25);%
    \titlerule[1pt]}{-3ex}{\LARGE\filcenter}%
\titleformat{\section}[display]{\bfseries}{\Large\endgraf%
    \tikz\draw[very thick,fill=black] (0,0) rectangle (3.5,-0.25);%
    \titlerule[1pt]}{-3ex}{\LARGE\filcenter \thesection~}

\begin{document}

    \chapter{Introduction}
    \section{Background}
\end{document} 

Answer 1

请随意调整以适合您的口味。

\documentclass[a4paper, 11pt,oneside]{book}
\usepackage{tikz}
\usepackage{xcolor}
\usepackage{titlesec}
\usepackage{newtx}

\usepackage{lipsum}% for mock text

\titleformat{\chapter}[display]
  {\LARGE}
  {\chaptername\ \thechapter}
  {1ex}
  {\formattitle[-\baselineskip]{\LARGE}{}}

\newcommand{\formattitle}[4][0pt]{%
  \parbox[t]{\textwidth}{%
    #2% fontsize
    \vspace{#1}
    \hrule
    \hrule height 3pt width 0.3\textwidth
    \vspace{0.2ex}
    \hspace{0.32\textwidth}%
    \parbox[t]{0.68\textwidth}{\raggedright#3#4}%
  }%
}

\titleformat{\section}[display]
  {\Large}
  {}
  {0pt}
  {\formattitle{\Large}{\thesection~}}
\titleformat{name=\section,numberless}[display]
  {\Large}
  {}
  {0pt}
  {\formattitle{\Large}{}}

\begin{document}

\tableofcontents

\chapter{Introduction}

\lipsum[1][1-3]

\section{Background}

\lipsum[1][1-3]

\section{A long section title that needs being split across lines}

\lipsum[1][1-3]

\section*{Unnumbered section}

\lipsum[1][1-3]

\end{document}