导出：选用pdf
参考官方链接：https://wkhtmltopdf.org/usage/wkhtmltopdf.txt
设置导出的大小可以用page-size也可以直接page-wight，page-height：
Page sizes: The default page size of the rendered document is A4, but using this --page-size optionthis can be changed to almost anything else, such as: A3, Letter and Legal. For a full list of supported pages sizes please see <http://qt-project.org/doc/qt-4.8/qprinter.html#PaperSize-enum>. For a more fine grained control over the page size the --page-height and --page-width options may be used
原文：https://www.cnblogs.com/daysn/p/12327196.html