我想要获得以下标题：
左页：\thepage\hfill\chaptername{}\thechapter
右页：\chaptername\hfill\thepage
因此我写道：
\documentclass{book}
\usepackage{fontspec} % enagles loading of OpenType fonts
\usepackage{polyglossia} % support for languages
% fonts:
\defaultfontfeatures{Scale=MatchLowercase,Mapping=tex-text} % without this XeLaTeX won't turn "--" into dashes
\setmainfont{Arial}
\setsansfont{Arial}
\setromanfont{Arial}
\setmonofont{DejaVu Sans Mono}
\usepackage{fancyhdr}
\fancyhf{}
\fancyhead[LO]{\thechapter}
\fancyhead[RE]{\chaptername}
\fancyhead[LE,RO]{\thepage}
\pagestyle{fancy}
\begin{document}
\chapter{foo}
Foo!
\chapter{bar}
Bar!
\chapter{baz}
Baz!
\end{document}
但它没有在页眉中打印章节名称。我做错了什么？
编辑：
目前最佳选择：
\documentclass{book}
\usepackage{fontspec} % enagles loading of OpenType fonts
\usepackage{polyglossia} % support for languages
% fonts:
\defaultfontfeatures{Scale=MatchLowercase,Mapping=tex-text} % without this XeLaTeX won't turn "--" into dashes
\setmainfont{Arial}
\setsansfont{Arial}
\setromanfont{Arial}
\setmonofont{DejaVu Sans Mono}
\usepackage{fancyhdr}
\renewcommand{\rightmark}[1]{\markboth{#1}{}}
\renewcommand{\leftmark}[1]{\chaptername{}\thechapter}
\fancyhf{}
\fancyhead[LO]{\leftmark}
\fancyhead[RE]{\rightmark}
\fancyhead[LE,RO]{\thepage}
\pagestyle{fancy}
\begin{document}
\chapter{foo}
Foo!
\chapter{bar}
Bar!
\chapter{baz}
Baz!
\end{document}
答案1
这将执行您指定的操作：
\documentclass{book}
\usepackage{fontspec} % enables loading of OpenType fonts
\usepackage{polyglossia} % support for languages
\usepackage{kantlipsum} % for mock text in the example
% fonts:
\defaultfontfeatures{Scale=MatchLowercase,Ligatures=TeX} % without this XeLaTeX won't turn "--" into dashes
\setmainfont{Arial}
\setsansfont{Arial}
\setmonofont{DejaVu Sans Mono}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\fancyhf{}
\fancyhead[RE]{\chaptername~\thechapter}
\fancyhead[LO]{\leftmark}
\fancyhead[LE,RO]{\thepage}
\begin{document}
\chapter{foo}
\kant
\chapter{bar}
\kant
\end{document}
注意一定\pagestyle{fancy}要去前标题和的重新定义\chaptermark。当前章节标题\leftmark可用作一定不能被重新定义。