上传文件到节点服务器角文件上传

我对我的英语很抱歉。我用MEAN堆栈书面方式我的应用程序。我发现上传图像和角文件上传是我的选择一些模块。但是，当我上传的图片在控制台上的百分比显示完成。我检查上传目录。该文件上传，但可以在图像Viever看不懂。

I'm sorry about my English. I am use MEAN stack for writting my app. I find out some modules for uploading image and angular-file-upload is my choice. But when I upload the image the percent show on console completed. I'm check upload directory. The file is uploaded but can not read in Image Viever.

下面的角度我code：

Here my code on angular :

        $scope.onFileSelect = function($files) {    
            for (var i = 0; i < $files.length; i++) {
                var file = $files[i];
                $scope.upload = $upload.upload({
                    url: '/posts/upload/',
                    method: 'POST',                 
                    file: file,
                }).progress(function(evt) {
                    console.log('percent: ' + parseInt(100.0 * evt.loaded / evt.total));
                }).success(function(data, status, headers, config) {
                    // file is uploaded successfully
                    console.log(data);
                });

            }
        };

在节点JS在这里，我的code：

Here my code on Node JS :

         exports.upload = function(req, res) {      
                       var data = new Buffer('');
                          req.on('data', function(chunk) {
                          data = Buffer.concat([data, chunk]);
                       });
                       req.on('end', function() {
                              req.rawBody = data;     
                              fs.writeFile(config.root + path.sep + 'public/upload' +                    path.sep + uuid.v1(), data ,function(err){
                             if(err) throw err;
                              console.log('ok saved')

                       });
                       res.send('ok');

                    });
              }

我想我做错事与节点，但我不能找到它。请告诉我我的错误。

I guess I do something wrong with Node but I can't find out it. Please tell me what my mistake.