使用xparse包

njuthesis.cls

@@ -39,8 +39,8 @@
 
 \ifthenelse{\equal{\Type}{thesis}}
 {
-  \newcommand{\typename}{\Degree 毕业论文}
+  \NewDocumentCommand \typename {} {\Degree 毕业论文}
 }
 {
-  \newcommand{\typename}{\Degree 毕业设计}
+  \NewDocumentCommand \typename {} {\Degree 毕业设计}
 }
\ No newline at end of file

profile/command.tex

-% 封面下划线
-\cs_new:Npn \cover_underline:nn #1 #2 {
-    \tl_if_empty:nTF {#1}
-    {\tl_set:Nn #1 {\textwidth}}
-    {}
-    \uline{\makebox[#1]{#2}}
-}

profile/format/abstract.tex

-\newenvironment{abstract}{%
+\NewDocumentEnvironment{abstract} {}
+{%
   \pagestyle{plain}
   \pagenumbering{Roman}
   \begin{center}
@@ -23,13 +24,14 @@
 }
 
 % 中文关键词
-\cs_new:Npn \keywords #1 {%
+\NewDocumentCommand \keywords {m} {%
   \par\vspace{2ex}\noindent%
   {\kaishu\zihao{-4}\makebox[4em][s]{关键词{：}}}~{#1}%
 }
 
 % 英文摘要
-\newenvironment{englishabstract}{%
+\NewDocumentEnvironment{englishabstract} {}
+{%
   \pagestyle{plain}
   \begin{center}
       \kaishu\zihao{-2}{\textbf{\uuline{南京大学本科生毕业论文(设计、作品)英文摘要}}}
@@ -51,7 +53,7 @@
 }
 
 % 英文关键词
-\cs_new:Npn \englishkeywords #1 {%
+\NewDocumentCommand \englishkeywords {m} {%
   \par\vspace{2ex}\noindent%
   {KEYWORDS{:}}~~{#1}%
 }
\ No newline at end of file

profile/format/cover.tex

+% 封面下划线
+\cs_new:Npn \cover_underline:nn #1 #2 {
+    \uline{\makebox[#1]{#2}}
+}
+
+% 封面标题
 \tl_new:N \cover_oneline_title
 \tl_set:Nn \cover_oneline_title {
   \begin{tabular}{p{4.2em}c}
@@ -39,10 +45,10 @@
   \end{tabular}
 }
 
-\tl_set:Nn \maketitle {%
+% 重定义maketitle生成封面
+\RenewDocumentCommand \maketitle {} {%
   \thispagestyle{empty}
   \pagenumbering{Roman}
-%   \pdfbookmark[0]{\njut@cap@cover}{cover}
   % Start 
   \begin{spacing}{1.25}
   \vskip 0mm  

profile/packages.tex

@@ -4,6 +4,7 @@
 \RequirePackage{geometry}
 \RequirePackage{ifthen}
 \RequirePackage{expl3}
+\RequirePackage{xparse}
 \RequirePackage{titlesec} 
 \RequirePackage{graphicx}
 \RequirePackage{ulem}

profile/profile.cls

@@ -4,7 +4,6 @@
     \input{profile/#1}
 }
 
-\profile_input{command.tex}
 \profile_input{packages.tex}
 \profile_input{format.tex}