function WelcomeCtl($scope, emailService) {
    $scope.save=function(){
        emailService.saveEmail(‘Hi’);
        }
}

WelcomeCtl.$inject = [$scope, emailService];

function SignupCtl($scope, emailService) {
    window.alert(emailService.getEmail())
}

SignupCtl.$inject = [$scope, emailService];

angular.module('myApp.services', [])
       .service('emailService', function (){
           var text =”start value”;
           return{
               saveEmail:function (data){
                  text  = data;

              },
              getEmail:function (){
                  return text;
              }
          };
      });