Angular service facory 区别

Service: the function that you write will be new-ed:

  myInjectedService  <----  new myServiceFunction()
Factory: the function (constructor) that you write will be invoked:

  myInjectedFactory  <---  myFactoryFunction()
What you do with that is up to you, but there are some useful patterns...

Such as writing a service function to expose a public API:

function myServiceFunction() {
  this.awesomeApi = function(optional) {
    // calculate some stuff
    return awesomeListOfValues;
  }
}
---------------------------------------------------------------------------------
// Injected in your controller
$scope.awesome = myInjectedService.awesomeApi();
Or using a factory function to expose a public API:

function myFactoryFunction() {
  var aPrivateVariable = "yay";

  function hello() {
    return "hello mars " + aPrivateVariable;
  }

  // expose a public API
  return {
    hello: hello
  };
}
---------------------------------------------------------------------------------
// Injected in your controller
$scope.hello = myInjectedFactory.hello();
Or using a factory function to return a constructor:

function myFactoryFunction() {
    return function() {
        var a = 2;
        this.a2 = function() {
            return a*2;
        };
    };
}
---------------------------------------------------------------------------------
// Injected in your controller
var myShinyNewObject = new myInjectedFactory();
$scope.four = myShinyNewObject.a2();

http://stackoverflow.com/questions/14324451/angular-service-vs-angular-factory