\label我在环境中使用\begin{theorem} ... \end{theorem}。如果定理语句开始于自然分页符附近并且启用了\pagestyle{fancy}from ，则该特定定理似乎出现故障。fancyhdr\label ... \ref
- 问题：单击链接无需指向定理环境，而是会转到正确位置之前的页面。
除此之外，一切似乎都运行良好，我偶然在包含数百个实例的大型文档中发现了这种意想不到的效果\label ... \ref。当然，MWE 大大降低了。
平均能量损失
\documentclass[12pt]{book}
\usepackage{setspace}
\usepackage{amsthm}
\usepackage{thmtools}
%\usepackage{mathtools}
%\usepackage{tocloft}
%\usepackage{titlesec}
\usepackage{fancyhdr}
\usepackage[hypertexnames=false]{hyperref}
%\usepackage{crossreftools}
\declaretheorem[numberwithin=chapter,style=plain,name=Theorem,refname={theorem, theorems},Refname={Theorem,Theorems}]{theorem}
\begin{document}
\pagestyle{fancy} %%%% <-- comment out to get working label-ref for 1.2
\chapter{Test Chapter}
\section{Test}
\subsection{Testing}
\onehalfspacing
\newpage
s\\
s\\
s\\
s\\
s\\
s\\
s\\
s\\
s\\
s\\
s\\
s\\
\begin{theorem}
\label{trm: test-label-to-theorem}
s\\
s\\
s\\
s\\
s\\
s\\
s\\
\end{theorem}
\begin{proof} s\\
s\\
s\\
s\\
s\\
s\\
\end{proof}
s%\\ %%%% <-- OR uncomment to get working label-ref for 1.2
\begin{theorem}
\label{trm: test-label-to-second-theorem}
sd
\end{theorem}
\noindent Working~\ref{trm: test-label-to-theorem}, not working~\ref{trm: test-label-to-second-theorem}
\end{document}
输出第三页：
- 重现：1.1 的链接工作正常，但 1.2 却不行（链接到第 2 页，而不是预期的第 3 页）。在我的大型原始文档中，我检查了大约 30 对其他
\label-\ref链接，全部按预期工作。
在.aux文件中，上述 MWE 除其他内容外，还写道：
\newlabel{trm: test-label-to-second-theorem}{{1.2}{3}{}{theorem.7}{}}
对于新手来说，这似乎没什么问题，因为 {3} 是目标页码。但是，单击 1.2 仍然会转到第 2 页。
- 问题原因：您可以注释掉
fancyheader，问题就消失了。或者，您可以稍微改变布局，在定理 1.2 之前添加一行，使其不那么靠近页面顶部。然后问题也会消失。
问题。如何解决这个问题？
要将修复程序应用于我的实际文档，我实际上无法删除\pagestyle{fancy}。由于对的数量很大\label ... \ref，手动检查哪些链接无法正常工作并逐一进行更改是不现实的，因此有必要采取一些全局解决方案。除了Underfull \hbox'es 之外，没有给出任何错误或警告，无论是 MWE 还是我的原始文档。
我正在运行pdfTeX，版本 3.141592653-2.6-1.40.25（MiKTeX 23.5）（预加载格式= pdflatex2023.7.12）；LaTeX2e<2023-06-01>补丁级别 1 L3 编程层<2023-06-30>；最新fancyhdr2022/11/09 v4.1；hyperref2023-06-25 v7.01a。
日志文件（用户账户名称已更改）
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Chapter 1.
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答案1
根据@Ulrike Fischer 的建议，可以amsthm修补\@thm和\@begintheoremhttps://github.com/latex3/hyperref/issues/332#issuecomment-2004158459\usepackage[hypertexnames=false]{hyperref}例如，在 MWE 中用以下代码替换：
\makeatletter
\let\@kernel@refstepcounter\refstepcounter
\usepackage[hypertexnames=false]{hyperref}
\usepackage{xpatch}
\xpatchcmd\@thm{\refstepcounter}{\@kernel@refstepcounter}{}{}%
\xpatchcmd\@begintheorem{\thmhead{#1}}{\thmhead{\MakeLinkTarget{\@currentcounter}#1}}{}{}%
\makeatother
所以它根本不使用 hyperref 来放置目标锚点。