install node.js on ubuntu

install-nodejs.txt

Method 1:

download node-xxx.gz on http://nodejs.org/

//extract file
tar -xf node-xxx.gz


(ps: compression can be done):
tar -cf node.gz folder1 folder2


//README.md tells me:

./configure
make 
make install

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Method 2: Official way
sudo apt-get install python-software-properties 
sudo add-apt-repository ppa:chris-lea/node.js 
sudo apt-get update 
sudo apt-get install nodejs 
sudo apt-get install npm

--------------- test --------------
sudo npm install -g component