%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% 标题、目录等设定
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% \renewcommand\abstractname{Summary}
%%\renewenvironment{abstract}{\noindent\rule{\textwidth}{.5pt}\\[2ex] \centering\begin{minipage}{.97\textwidth}{\zihao{-4}\sffamily\bfseries \centering{\abstractname}}\\}
%%{\par\noindent\end{minipage}\\[2ex] \rule{\textwidth}{.5pt}}

% \renewenvironment{abstract}{\noindent\rule{\textwidth}{.5pt}\\[2ex] \centering\begin{minipage}{.97\textwidth}\begin{center}{\zihao{-4}\sffamily\bfseries \abstractname} \\ \end{center}}
%     {\par\end{minipage}\\[2ex] \noindent\rule{\textwidth}{.5pt}}

%目录
\titlecontents{section}[3.8em]%左间距
{\zihao{-4}}%\fzss \vspace{3pt}}%字号
{\contentslabel{2em}}
{}%\hspace*{-4em}}
{~\titlerule*[0.25pc]{$.$}~\contentspage\hspace*{1cm}}%样式，最后留出1cm的右间距

\titlecontents{subsection}[3.8em]%左间距
{\zihao{-4}}%\fzss \vspace{3pt}}%字号
{\contentslabel{2em}}
{}%\hspace*{-4em}}
{~\titlerule*[0.25pc]{$.$}~\contentspage\hspace*{1cm}}%样式，最后留出1cm的右间距

\titlecontents{subsubsection}[3.8em]%左间距
{\zihao{-4}}%\fzss \vspace{3pt}}%字号
{\contentslabel{2em}}
{}%\hspace*{-4em}}
{~\titlerule*[0.25pc]{$.$}~\contentspage\hspace*{1cm}}%样式，最后留出1cm的右间距

%% section
\titleformat{\section}
[hang]
{\sffamily}
{\zihao{-3}\bfseries\thesection.}
{1pt}
{\zihao{-3}\bfseries\filcenter}

%% subsection
\titleformat{\subsection}
[hang]
{\sffamily}
{\zihao{4}\bfseries\thesubsection}
{1pt}
{\zihao{4}\bfseries\filright}

%% subsubsection
\titleformat{\subsubsection}
[hang]
{\sffamily}
{\zihao{-4}\bfseries\thesubsubsection}
{1pt}
{\zihao{-4}\bfseries\filright}