How to upgrade nodejs

The node binary module "n" is able to upgrade the nodejs version.  Follow the below step:

1. Check the current node version. 

node -v

2. Clean the npm cache.

sudo npm cache clean -f

3. Install the "n“ module.

sudo npm install -g n

4. Use "n" module to install the specific version nodejs.

sudo n stable / sudo n v0.12.2

The idea is from internet, put it down for future reference.