一、基于centos7的crossbar安装(已经安装好python)
(1) sudo yum update
(2) sudo yum install gcc gcc-c++ make openssl-devel libffi-devel
(3)运行 which python 查询python所在目录，并转到该目录运行pip install crossbar
(4)运行crossbar version查询安装是否成功，如果成功，将该目录写进$HOME/.profile即运行export PATH=${HOME}/(your path)