\begin{tikzcd} A \arrow[r, "\phi"] \arrow[d, red] & B \arrow[d, "\psi" red] \\ C \arrow[r, red, "\eta" blue] & D \end{tikzcd} 怎么渲染这种交换图？
\begin{tikzcd}
A \arrow[r, "\phi"] \arrow[d, red]
& B \arrow[d, "\psi" red] \
C \arrow[r, red, "\eta" blue]
& D
\end{tikzcd}
怎么渲染这种交换图？