nodejs6.6 yum源安装
系统是Centos6.5 x86_64，github上有对应系统的安装版本，还是比较详细的，下面三步执行完，直接yum install nodejs 就安装了。
curl-sLhttps://rpm.nodesource.com/setup_6.x|bash-
curl-sL-o'/tmp/tmp.jl0ccbLo3X''https://rpm.nodesource.com/pub_6.x/el/6/x86_64/nodesource-release-el6-1.noarch.rpm'
curl-sLf-o/dev/null'https://rpm.nodesource.com/pub_6.x/el/6/x86_64/nodesource-release-el6-1.noarch.rpm'
