javascript - nodeJs Invalid listen argumen -

var http = require('http');  var port = process.argv.slice(2);  http.createserver(function (request, response) {   response.writehead(200, {'content-type': 'text/plain'});   setinterval(function(){     response.write(new date() + "\n");    }, 1000);    //response.end('hello world\n'); //we cant use .write after end.  }).listen(port); console.log("server running @ http://127.0.0.1:" + port); 

executing: node server.js 3000

gettint error:

throw new error('invalid listen argument: ' + h); ^ error: invalid listen argument: 3000

what miss?

in code port appears empty array, it's not appropriate parameter listen() try log port before usage