title: “一个PDF实验文档”
author: “我”
date: “2021/12/26”
output:
pdf_document:
header-includes:
toc: TRUE
latex_engine: xelatex
fontsize: 12pt

• |

  \usepackage{fancyhdr}
  \pagestyle{fancy}
  \fancyhf{}
  \fancyhead[RE,RO]{\thepage}
  \fancyhead[LO]{\rightmark}
  \fancyhead[LE]{\leftmark}
  

knitr::opts_chunk$set(echo = TRUE)

R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com.

When you click the Knit button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

summary(cars)

\newpage

Including Plots

You can also embed plots, for example:

plot(pressure)

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.

编译出错：
output file: 4huifu.knit.md

! LaTeX Error: Unicode character 涓€ (U+4E00)
not set up for use with LaTeX.

错误: LaTeX failed to compile 4huifu.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips. See 4huifu.log for more info.
停止执行

我是按照新建文档->rmarkdown文档->输出PDF。流程新建的文档，然后将您给的页眉页脚定义YAML部分拷贝到我的文档相应部分，编译出现错误提示。开始以为中文汉字的问题，将title及author中的中文换成英文，错误照旧。
不知道是哪里除了问题，看来我这需要恶补的东西还很多，我再查查吧。

谢谢老师不厌其烦的耐心指教!!!