退出状态码 '126' 表示出了点问题：\nstderr: "sh: /usr/local/bin/wkhtmltopdf-amd64: cannot execute binary file\n"\nstdout: ""\ncommand: /usr/local/bin /wkhtmltopdf-amd64 --lowquality --footer-center '页面（[页面]）''/var/tmp/knp_snappy60f672f996f208.00956633.html''/var/tmp/knp_snappy60f672f9971c26.60654885.pdf'。”