update node js

1sudo npm install npm@latest -g

1//First, clear the npm cache:
2	npm cache clean -f
3
4//Install n, Node’s version manager:
5	npm install -g n
6    
7//With the n module installed, you can use it to:
8	Install the latest stable version: n stable
9	Install the latest release: n latest

1sudo n stable
2

1sudo npm install -g n
2

1sudo npm cache clean -f
2

1sudo n 0.8.20
2