这就是我想要做的
\begin{tikzpicture}
[node distance = 1cm, auto,font=\footnotesize,
% STYLES
every node/.style={node distance=1.3cm},
comment/.style={rectangle, inner sep= 5pt, text width=4cm, node distance=0.25cm, font=},
module/.style={rectangle, drop shadow, draw, fill=black!10, inner sep=5pt, text width=3cm, text badly centered, minimum height=0.8cm, font=\bfseries\footnotesize\sffamily,rounded corners},
selected/.style={fill=red!40}]
\node [module] (nodeA) {node A};
\node [module, below of=nodeA] (nodeA) {node B};
\only<1>{
\node [comment, text width=6cm, right=0.25 of nodeA] {short description of Node A};
\node [comment, text width=6cm, right=0.25 of nodeB] {short description of Node B};
}
\only<2>{
\node [selected] (nodeA) …