change toc

\documentclass{ctexbook}
\usepackage{zhlipsum}
\usepackage{xpatch}
\ExplSyntaxOn
\makeatletter
\xpatchcmd{\addcontentsline}{\thepage}{\thechapter--\thepage}{\typeout{toc succeed}}{toc fail}
\cs_set_eq:NN \oldaddcontentsline \addcontentsline
\xpatchcmd{\@chapter}
  {\CTEX@addtocline{chapter}{#1}}
  {
    \xpatchcmd{\addcontentsline}{\thechapter--\thepage}{}{\typeout{chaptoc succeed}}{chaptoc fail}
    \CTEX@addtocline{chapter}{#1}
    \let\addcontentsline\oldaddcontentsline
  }{\typeout{Success}}{\typeout{Failed!}}
\makeatother
\ExplSyntaxOff

\begin{document}
\frontmatter
  \tableofcontents
\mainmatter
  \chapter{测试}
  \section{测试}
  \zhlipsum
  \section{测试}
  \zhlipsum
  \subsection{测试}
  \zhlipsum
  \chapter{测试}
  \zhlipsum
  \section{测试}
  \zhlipsum
  \section{测试}
  \zhlipsum
  \subsection{测试}
\end{document}