结合上面的“定义模块”和“定义服务”，我们可以方便地组织自己的额外代码：

angular.module('MyModule', [], function($provide){
  $provide.factory('S1', function(){
    return 'I am S1';
  });
  $provide.factory('S2', function(){
    return {see: function(){return 'I am S2'}}
  });
});

var app = angular.module('Demo', ['MyModule'], angular.noop);
app.controller('TestCtrl', function($scope, S1, S2){
  console.log(S1)
  console.log(S2.see())
});