问题出处：
- https://github.com/l0o0/jasminum/issues/7
解决方案：
1 2 3 4 5 6 7 8 9 | 感谢分享！顺便说下macos(10.15)用户： 下载：https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/pdftk_server-2.02-mac_osx-10.11-setup.pkg 路径：/opt/pdflabs/pdftk/. （该路径默认对外隐藏无法选取） 选择路径的技巧：shift+command+G: 输入：/opt/pdflabs/pdftk/，选择bin确认 官网：https://www.pdflabs.com/tools/pdftk-server/ After installation, open a Terminal, type pdftk and press Return. Pdftk will respond by displaying brief usage information. Access pdftk documenation by running man pdftk. This installer creates a directory on you Mac: /opt/pdflabs/pdftk/. This will contain a bin directory which holds the pdftk program and a docs directory which holds the complete PDFtk manual. |