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CentOS上可以自行下载*.tar.gz安装包通过编译的方式安装，也可采用EPEL方式安装：

Node.js and npm are available from the Fedora Extra Packages for Enterprise Linux (EPEL) repository. If you haven't already done so, first enable EPEL.

1. To check if you have EPEL, run

yum repolist 

2. if you don't see epel, install it via RPM (At the time of this writing, the last version is 6.8)

rpm -Uvh http://download-i2.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm 

3. And then run the following command to install node and npm:

yum install nodejs npm --enablerepo=epel 

4. if step 3 doesn't work for you install node separately:

yum install npm --enablerepo=epel