图片切割(裁剪)系统 作者声明：

首先js是不能操作客户端文件的(除非特殊情况)，所以图片的切割必须在后台处理，对于客户端的图片可以先上传再切割或者把图片和切割参数一起传递到服务器再处理（上传文件不在本次讨论范围，请自行修改）；还有是通过客户端传递的参数来处理图片，确实能得到展示图或预览图的效果。

图片切割(裁剪)系统 ASP版需要aspjpeg组件支持。-Picture cutting (cutting) the system of declaration: First js not operating client files of the picture cutting (unless special circumstances), it must be in the background processing, the client' s picture can first upload and then cutting or the picture and cutting parameters with the pass processing to the server (upload file is not in the scope of this discussion, please modify)　There is a parameter passed by the client to deal with the picture, can really be exhibited or preview effect. Picture cutting (cropped) system the ASP version needs aspjpeg components for support.