How does Latex set the font color of hyperlinks? How to change the color?

First you need to import the color package:

\usepackage{color}

Then import the hyperlink package

\usepackage{hyperref}

Set the color of hyperlinks

\hypersetup{
    colorlinks=true,
    linkcolor=blue,
    filecolor=blue,      
    urlcolor=blue,
    citecolor=cyan,
}
%改变颜色

Then you can insert a hyperlink through href, the specific syntax:

\href{超链接}{描述}

What if you want to change the color back or set it to a color other than the one in hypersetup?

\href{超链接}{\textcolor{想要修改的颜色}{描述}}

This way you can change it to the color you want