改进和简化新的控制

Question

我想改进列表中的新命令，尤其是\did命令。我必须在其中使用参数#1和吗\def\？谢谢。

\documentclass[a4paper,12pt]{article}
\usepackage{xcolor}

\newcommand\as[1]{\color{red}\textsl{#1 }\color{black}}
\newcommand\did{}\def\did#1\par{\large\par\vspace{5mm}\noindent\textsl{#1}\par}

\begin{document}

\did
This text must be spaced 5mm apart at the top and must be
italicized throughout its length.

This text, on the other hand,
is normal \as{(it should become italicized and red here)}.
Here it should go back to normal and black.

\end{document}

Answer 1

我会在这里使用标准 LaTeX 语法，既用于定义（所以没有\def），也用于文档命令（环境而不是\par分隔的宏）。同时保持文本\large的本地化did，并且不在后面添加空格\as{...}

\documentclass[a4paper,12pt]{article}
\usepackage{xcolor}

%using tex grouping (and no extra space
\newcommand\as[1]{\textsl{\color{red}#1}}

% using an environment, keeping the size change just to the did text,
% not the rest of the document,
\newenvironment{did}
 {\par\setlength\parindent{0pt}\large\vspace{5mm}\slshape}
 {\par}

\begin{document}

Earlier text.
\begin{did}
This text must be spaced 5mm apart at the top and must be
italicized(or rather slanted)  throughout its length.  
\end{did}

This text, on the other hand,
is normal \as{(it should become italicized (acually slanted)and red here)}.
Here it should go back to normal and black.

\end{document}