asp.net 和flex的头像上传,实现图片的上传前预览，截取和保存-upload asp.net and flex the head to realize the image before uploading preview, capture and save

在客户端确定缩放后的头像，然后原图和选取的区域坐标信息一起上传到后台，由后台进行截取、压缩等操作-The client to determine the scaled picture, then original image and a selected area along the coordinate information uploaded to the background, the background capture, compression and other operations