> For the complete documentation index, see [llms.txt](https://ayakaleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ayakaleaf-pro.ayaka.space/latex/zh-cn/latex-cuo-wu/30-there-were-undefined-references.md).

# 存在未定义的引用

当出现以下情况时，此错误会出现 **`\ref{...}`** 被使用，而 LaTeX 无法找到对应的标签。造成这种情况有三种方式。

* 在……中有拼写错误 **`\label{...}`**
* 在……中有拼写错误 **`\ref{...}`**
* 有一个标签被遗漏了。

下面给出一个示例

```latex
\section{introduction}\label{introduction}
引用引言部分时的拼写错误会是 \ref{intorduction}。

另一种错误是引用一个从未定义过的标签，例如 \ref{section1}
```

以上每种情况都会生成如下所示的错误

main.tex，第 6 行

第 1 页上的引用 \`intorduction' 在输入第 6 行未定义。

main.tex，第 6 行

第 1 页上的引用 \`section1' 在输入第 8 行未定义。

main.tex，第 6 行

存在未定义的引用。

为避免这种情况，当我们使用 **`\ref{...}`**时，必须有相应的 **`\label{...}`**，并且 **`\ref{...}`** 和 **`\label{...}`** 的参数相同。


---

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