Node.js installation was successful but, while running a test file it is showing a error . please help to fix this

This is the error while I’m running from Node.js Command prompt

This is the error while I’m running from power shell or CMD

This is the code file

Code:

var http = require('https');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end('Hello World!');
}).listen(8080);

Error:

asd.js : The term 'asd.js' 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
+ asd.js
+ ~~~~~~
+ Category Info          : ObjectNotFound: (asd.js:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException