user.signup function question

user.signup function question

.controller('LoginCtrl', function($scope, $state) {
    $scope.data = {};

    $scope.signupEmail = function(){  
        //Create a new user on Pasre
        var user = new Parse.User();
        user.set("username", $scope.data.username);
        user.set("password", $scope.data.password);
        user.set("email", $scope.data.email);
       
        
        
        user.signUp(null, {
            success: function(user) {
                alert("sucess!");
                $state.go('dashboard'); //causes app to change "state" or "view" upon success, required the injection of $state
            },
            error: function(user, error) {
                alert("Error: " + error.code + " " +error.message);
            }
        });
    };