来源：https://en.wikibooks.org/wiki/LaTeX/Macros
方括号中的参数其实就是默认参数。
使用方法：
\newcommand{name}[num][default]{definition}例子：
```tex
\newcommand{}[2][Wikimedia]{
This is the Wikibook about LaTeX
supported by
来源：https://en.wikibooks.org/wiki/LaTeX/Macros
方括号中的参数其实就是默认参数。
使用方法：
例子：
```tex
\newcommand{}[2][Wikimedia]{
This is the Wikibook about LaTeX
supported by
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