引入宏包：\usepackage{subfigure}
\begin{figure}[htbp]\centering\subfigure[microwave]{\includegraphics[width=0.31\textwidth]{pic/salepermonth_mic.png}}\subfigure[hair dryer]{\includegraphics[width=0.31\textwidth]{pic/salepermonth_hair.png}}\subfigure[pacifier]{\includegraphics[width=0.31\textwidth]{pic/salepermonth_pac.png}}\caption{Monthly sales curve for the top three products}\label{fig:fig_micPerMon}\end{figure}
效果：
