PS F:\Khoa's file\CSDLPT\Nodejs> node demo.js
node : The term 'node' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify 
that the path is correct and try again.
At line:1 char:1
+ node demo.js
+ ~~~~
    + CategoryInfo          : ObjectNotFound: (node:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException