目录：

Foreach例子演示

\begin{tikzpicture}[scale=4]
    \newcommand{\point}% {\x\y\z}
        {\footnotesize{$\{x \ifodd \x +1 \fi, y \ifodd \y +1 \fi,z \ifodd \z +1 \fi \}$}}
    \foreach \x in {0,1}
        \foreach \y in {0,1}
            \foreach \z in {0,1}
                \path[draw]
                   ($\x*(1,0)+\y*(0,1)+\z*(0.4,0.2)$)
                        node[label=90:\point] (\x\y\z) {}
                        circle (1pt);
    \path[draw]
        (2,1.0)
            node (positive) [label=0:$+ A$] {}
            circle (1pt)
        (2,0.5)
            node (negative) [label=0:$- A$] {}
            circle (1pt);
    \foreach \x in {0,1}
        \foreach \y in {0,1}
            \path[draw]
                (\x\y0) -- (\x\y1)
                (\x0\y) -- (\x1\y)
                (0\x\y) -- (1\x\y);
    \foreach \x in {000,011,101,110,positive}
        \path[fill]
            (\x) circle (1pt);
\end{tikzpicture}

箭头放到直线中间

\usetikzlibrary{decorations.markings}
\tikzset{
  arrowmark/.style 2 args={postaction={decorate},decoration={markings,mark=at position #1 with \arrow{#2}}}
}
\begin{tikzpicture}
\path[draw,arrowmark={.5}{>}] (0,0) -- (0,1);
\end{tikzpicture}

展开TeX命令

\begin{tikzpicture}
\path[style/.expanded={draw,color=red},label/.expanded={90:$x$}] (0,0);
\end{tikzpicture}

箭头

建议使用\usetikzlibrary{arrows.meta}。