更改 dirtree 的字体

Question

我怎样才能将字体更改dirtree为罗马字体（即\textrm{}）

平均能量损失

\documentclass[a4paper,12pt]{article}

\usepackage{dirtree}

\begin{document}

\dirtree{%
.1 Hardware.
.2 Devices.
.3 Tablets.
.4 Operating-System: Android.
}

\end{document}

Answer 1

\documentclass[a4paper,12pt]{article}

\usepackage{dirtree}

\begin{document}
\dirtree{%
.1 Hardware.
.2 Devices.
.3 Tablets.
.4 Operating-System: Android.
}


\renewcommand\DTstyle{\rmfamily}
\dirtree{%
.1 Hardware.
.2 Devices.
.3 Tablets.
.4 Operating-System: Android.
}

\end{document}