答案1
您可以pic
为此添加一个。
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[pics/parallel arrow/.style={code={
\draw[-latex] (-#1) -- (#1);}}]
\node[circle,draw] (v1) {};
\node[circle,draw,below right of=v1] (v2) {};
\path[draw] (v1) --
pic[sloped,red,semithick,auto,swap]{parallel arrow={0.3,-0.15}} (v2);
\end{tikzpicture}
\end{document}