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最后一页上的文字不同

tag-icon • tag-icon conditionals lastpage
最后一页上的文字不同

我想添加两种不同的文本之一，具体取决于它是否出现在最后一页。

我尝试过这个：

\documentclass{article}
\usepackage[angle=0, opacity=1, scale=1,position={0,0}]{background}
\usepackage{lastpage}

\setlength{\parskip}{6cm}

\begin{document}
\SetBgContents{
\ifnum\thepage=\pageref{LastPage} This is the last page\else More pages follow\fi
}

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

\end{document}

但是当.aux文件尚未创建时，此操作会失败：

! Missing number, treated as zero.
<to be read again>
                   \protect
l.22 A
       lot of paragraphs

我认为是因为那时\pageref{LastPage}我??无法用 来进行比较\ifnum。

我怎样才能让它工作？

答案1

命令\label{mytag}定义了命令\r@mytag。这意味着你可以测试该命令是否存在，并做出相应的反应：

\documentclass{article}
\usepackage[angle=0, opacity=1, scale=1,position={0,0}]{background}
\usepackage{lastpage}

\setlength{\parskip}{6cm}

\begin{document}
\makeatletter
\SetBgContents{
 \@ifundefined{r@LastPage}{%
  RECOMPILE%
 }{%
  \ifnum\thepage=\pageref{LastPage} This is the last page\else More pages follow\fi
 }%
}
\makeatother

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

A lot of paragraphs

\end{document}

答案2

使用包\getpagerefnumber的命令解决了refcount：

\usepackage{refcount}

...

\ifnum\thepage=\getpagerefnumber{LastPage} This is the last page\else More pages follow\fi

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