一、直接使用enumerate

        源码：

\documentclass{article}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        效果：可看到，默认的是以数字序号作为标签样式，即1. 、2.、3.等

 

二、配合enumitem包使用enumerate

        配合enumitem包需要在LaTeX之中导入该包，具体就是在源码之中加入下面一行代码(\begin{document}之前)：

\usepackage{enumitem}

        样式1：数字序号+括号 (关键代码在第6行，后面也是)

\documentclass{article}
\usepackage{enumitem}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}[label=(\arabic*)]
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        样式1效果

        样式2：粗体数字序号

\documentclass{article}
\usepackage{enumitem}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}[label=$\mathbf{\arabic*}.$]
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        样式2效果

        样式3：粗体数字序号+括号

\documentclass{article}
\usepackage{enumitem}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}[label=$(\mathbf{\arabic*})$]
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        样式3效果

        样式4：小写字母

\documentclass{article}
\usepackage{enumitem}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}[label=\alph*.]
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        样式4效果

        样式5：大写字母

\documentclass{article}
\usepackage{enumitem}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}[label=\Alph*.]
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        样式5效果

        样式6：罗马字母(注意，这个也可以大写)

\documentclass{article}
\usepackage{enumitem}
\begin{document}
\section{LaTeX Style Sample}
There is nothing to show, thank you for reading.
\begin{enumerate}[label=\roman*.]
    \item Apple is a kind of fruit.
    \item Cat is a kind of animal.
    \item Butterfly is a kind of insect.
\end{enumerate}
\end{document}

        样式6效果

        其他样式：根据上述的示例，相信聪明的你可以快速猜到如何得到其他你所需要的标签样式，觉得有用请点个赞，感谢。有缘在此相见，祝各位科研顺利。

三、LaTeX编译环境

        1. 编辑+编译环境：Overleaf

        2. 包的引用：已在上述源码给出

        3. 文件之间的引用：无，项目中仅有一个main.tex文件

四、参考

        1. LaTeX使用enumitem包