接续上一篇，提供原码如下：
用 \usepackage{fancyhdr} 就出错(但还是有产生pdf档)
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\documentclass[12pt,a4paper,oneside]{exam}
\newenvironment{indention}[1]{\par
\addtolength{\leftskip}{#1}
\begingroup}{\endgroup\par}
\usepackage[margin=2cm]{geometry}
\usepackage{fontspec}
\usepackage{xeCJK}
\setCJKmainfont{cwyen.ttf}
\XeTeXlinebreaklocale "zh"
\XeTeXlinebreakskip = 0pt plus 1pt
\usepackage{amssymb}
\usepackage{harpoon}
\usepackage{fancyhdr}
\begin{document}
我是天才
\end{document}