如何在外部获得response的值？

app.controller('postCtrl', ['$scope', 'myservice', function($scope, myservice){
    myservice.getData().success(function(res){
        $scope.posts = res.records;
        console.log($scope.posts);  //这个有输出
    });
    console.log($scope.posts); //这个却显示undefined

}]);

app.factory('myservice', ['$http', function($http){
    return {
        getData: function(){
            return     $http.get("post_info.php");    
        }
    }
}]);