latex beamer setup

beamer.tex

\documentclass[aspectratio=169]{beamer}
    \usepackage{graphicx}
    \usepackage[UTF8,fontset=none]{ctex}
    \usepackage{hyperref}
    \usepackage{amsmath}
    
    \hypersetup{colorlinks=true}
    \graphicspath{{../img/}}
    
    \setCJKmainfont{思源黑体 CN Medium}
    \usetheme{metropolis}
    \setsansfont{Roboto}
    
    \title{}
    \date{\today}
    \author{}
    \institute{}
    
    \begin{document}
    \maketitle
    
    \begin{frame}{目录}
        \tableofcontents
    \end{frame}

    \section{}
    \begin{frame}{}

    \end{frame}

\end{document}

image on full slide

   \usepackage{tikz}

    \begin{frame}{}
        \begin{tikzpicture}[remember picture,overlay]
            \node[at=(current page.center)] {
                \includegraphics[width=\paperwidth, height=\paperheight]{1.jpg}
            };
        \end{tikzpicture}
    \end{frame}