latex 改变段落格式

 读者记： \vspace{length}要空一行。例： \vspace{2mm}。要不然就2啦。

          {\color{violet} LDV: a variable whose range is restricted in some way.} 加颜色

        \insetbeamertemplate{footline}[frame number]  加页码（beamer）

Vertical Space

The space between paragraphs, sections, subsections, etc. is determined automatically by LaTeX. If you want to customize the default paragraph spacing, it can be achieved with the following command in the preamble of your document:

 \parskip 7.2pt

If necessary, additional vertical space between two paragraphs can be added with the command:

 \vspace{length} 

This command should normally be used between two empty lines. If the space should be preserved at the top or at the bottom of a page, use the starred version of the command,\vspace*, instead of \vspace. The \stretch command, in connection with \pagebreak, can be used to typeset text on the last line of a page, or to center text vertically on a page.

Additional space between two lines of the same paragraph or within a table is specified with the

 \\[length] 

command.

If you want to add space at the beginning of the document, without anything else written before, then you may use

 { \vspace*{length} } 

It's important you use the \vspace* command instead of \vspace, otherwise latex can silently ignore the extra space.