A主機：本地客戶機
B主機：遠程主機
id_rsa：B生成的密鑰文件，已拷貝至A
B拷貝文件至A命令：
scp -i /Users/songfayuan/.ssh/id_rsa songfayuan@B主機IP地址:/root/file1.txt /Users/songfayuan/file1.txt
A拷貝文件至B命令：
scp -i /Users/songfayuan/.ssh/id_rsa -r /Users/songfayuan/HBuilderProjects/shengqian/unpackage/dist/build/h5/ songfayuan@B主機IP地址:/usr/share/nginx/html