JQuery全局变量不起作用

Question

我的变量范围有问题，我不知道我做错了什么！ 我想从ajax成功范围中获取文件路径，但它不起作用。我的错误在哪里都有胶水。

问候！

            var uploadPathPicture;
            var uploadPictureFileData           = $('#profilbild').prop('files')[0];
            var uploadPictureFileDataFormData   = new FormData();

            uploadPictureFileDataFormData.append('file', uploadPictureFileData);
            uploadPictureFileDataFormData.append('mail', $('#mail').val());

            $.ajax({
                type: 'POST',
                url: '../php/uploadPicture.php',
                data: uploadPictureFileDataFormData,
                dataType: 'text',
                cache: false,
                processData: false,
                contentType: false,
                success: function(result)
                {
                    //uploadPathPicture = result;
                    uploadPathPicture = "huhu";
                    console.log(uploadPathPicture);
                }
            });

            alert(uploadPathPicture);