angularjs - javascript how to create function service (constructor) -

in angularjs if invoke service method:

app.service('nameservice', function(){ this.service = function (){console.log('hello')} } 

then can use service (object) : nameservice.service() question how can write function have 2 arguments(name, function)

function service ( name, function ){ // how angular declare object value of first argument ?  } 

i'm ask how write function service(name,fn){} ?

angularjs use dependency injection inject service.

"service" method available on angular object because on prototype.

angular.prototype.service = ... 

you can read more prototype inheritance, mdn - inheritance , prototype chain