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Overleaf 上使用中文

最简单的做法是使用 ctex 宏包，再使用 XeLaTeX 或者 LuaLaTeX 编译，但是会出现警告： 

1
Font "FandolSong-Regular" does not contain requested Script "CJK"

为了消除这个警告，需要配置 Overleaf 上的中文字体，之后在主文件中指定 fontset 即可。

main.tex
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\documentclass[fontset=overleaf]{ctexart}
\usepackage{zhlipsum}
\begin{document}
\zhlipsum
\end{document}
ctex-fontset-overleaf.def
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% https://sikouhjw.gitee.io/2021/02/14/2021-02-14-fontset-overleaf/
\GetIdInfo$Id: ctex.dtx 81d4c90 2020-10-19 20:24:58 +0800 Qing Lee <sobenlee@gmail.com> $
  {Overleaf fonts definition (CTEX)}
\ProvidesExplFile{ctex-fontset-overleaf.def}
  {\ExplFileDate}{2.5.5}{\ExplFileDescription}
\ctex_fontset_case:nnnn
  { \ctex_fontset_error:n { ubuntu } }
  {
    \ctex_zhmap_case:nnn
      {
        \setCJKmainfont { :2:NotoSerifCJK-Regular.ttc }
          [ BoldFont = :2:NotoSerifCJK-Bold.ttc, ItalicFont = gkai00mp.ttf ]
        \setCJKsansfont { :2:NotoSansCJK-Regular.ttc  }
          [ BoldFont = :2:NotoSansCJK-Bold.ttc  ]
        \setCJKmonofont { :2:NotoSerifCJK-Regular.ttc }
          [ BoldFont = :2:NotoSerifCJK-Bold.ttc ]
        \setCJKfamilyfont { zhsong } { :2:NotoSerifCJK-Regular.ttc }
          [ BoldFont = :2:NotoSerifCJK-Bold.ttc ]
        \setCJKfamilyfont { zhhei  } { :2:NotoSansCJK-Regular.ttc  }
          [ BoldFont = :2:NotoSansCJK-Bold.ttc  ]
        \setCJKfamilyfont { zhkai  } { gkai00mp.ttf  }
        \ctex_punct_set:n { ubuntu }
        \ctex_punct_map_family:nn   { \CJKrmdefault        } { zhsong  }
        \ctex_punct_map_family:nn   { \CJKsfdefault        } { zhhei   }
        \ctex_punct_map_family:nn   { \CJKttdefault        } { zhsong  }
        \ctex_punct_map_itshape:nn  { \CJKrmdefault        } { zhkai   }
        \ctex_punct_map_bfseries:nn { \CJKsfdefault, zhhei } { zhheib  }
        \ctex_punct_map_bfseries:nn
          { \CJKrmdefault, \CJKttdefault, zhsong }
          { zhsongb }
      }
      {
        \ctex_load_zhmap:nnnn { rm } { zhhei } { zhsong } { ubuntu }
        \ctex_punct_set:n { ubuntu }
        \ctex_punct_map_family:nn   { \CJKrmdefault } { zhsong }
        \ctex_punct_map_bfseries:nn { \CJKrmdefault } { zhhei  }
        \ctex_punct_map_itshape:nn  { \CJKrmdefault } { zhkai  }
      }
      { \ctex_fontset_error:n { ubuntu } }
  }
  {
    \ctex_set_upmap_unicode:nnn { upserif }
      { :2:NotoSerifCJK-Regular.ttc     } { :2:NotoSerifCJK-Bold.ttc    }
    \ctex_set_upmap_unicode:nnn { upsans  }
      { :2:NotoSansCJK-Regular.ttc      } { :2:NotoSansCJK-Bold.ttc     }
    \ctex_set_upmap_unicode:nnn { upmono  }
      { :2:NotoSansMonoCJK-Regular.ttc  } { :2:NotoSansMonoCJK-Bold.ttc }
    \ctex_set_upmap:nnn { upserifit } { gkai00mp.ttf  } { }
    \ctex_set_upfamily:nnn { zhsong } { upzhserif   } { upzhserifb }
    \ctex_set_upfamily:nnn { zhhei  } { upzhsans    } { upzhsansb  }
    \ctex_set_upfamily:nnn { zhfs   } { upzhmono    } { }
    \ctex_set_upfamily:nnn { zhkai  } { upzhserifit } { }
  }
  {
    \setCJKmainfont { Noto~Serif~CJK~SC     } [ ItalicFont = AR~PL~KaitiM~GB ]
    \setCJKsansfont { Noto~Sans~CJK~SC      }
    \setCJKmonofont { Noto~Sans~Mono~CJK~SC }
    \setCJKfamilyfont { zhsong } { Noto~Serif~CJK~SC }
    \setCJKfamilyfont { zhhei  } { Noto~Sans~CJK~SC  }
    \setCJKfamilyfont { zhkai  } { AR~PL~KaitiM~GB   }
    \setCJKfamilyfont { zhfang } { FandolFang        }
  }
\NewDocumentCommand \songti   { } { \CJKfamily { zhsong  } }
\NewDocumentCommand \heiti    { } { \CJKfamily { zhhei   } }
\NewDocumentCommand \kaishu   { } { \CJKfamily { zhkai   } }
\NewDocumentCommand \fangsong { } { \CJKfamily { zhfang   } }
%%
%%
%% End of file `ctex-fontset-overleaf.def'.