_output.yml

bookdown::gitbook:
  css: [css/style.css, css/toc.css]
  config:
    toc:
      before: |
        <li><a href="https://github.com/DataXujing/lxqa-api" target='blank'>项目地址</a></li>
      after: |
        <li><a href="http://www.inter-credit.net/" target="blank">公司主页</a></li>
    download: ["pdf", "epub"]
bookdown::pdf_book:
  includes:
    in_header: preamble.tex
  latex_engine: xelatex
  citation_package: natbib
  keep_tex: yes
bookdown::epub_book: default