支持移动端裁剪图片插件Jcrop（结合WebUploader上传）

　　<script type="text/javascript" src="@(WeixinConfig.ResourceAddress)js/jcrop/jquery.Jcrop.js"></script>
    <script type="text/javascript" src="@(WeixinConfig.ResourceAddress)js/jcrop/jquery.color.js"></script>
    <link rel="stylesheet" href="@(WeixinConfig.ResourceAddress)js/jcrop/jquery.Jcrop.css">

　　　　<div id="jcropBox" style="width: 100%; height: 90%;">
            <!-- This is the image we‘re attaching Jcrop to -->
            <img src="" id="jcropTarget"  />
        </div>

// 默认参数初始化Jcrop
$("#jcropTarget").Jcrop();  

　　　　　　$(‘#jcropTarget‘).Jcrop({
                onChange: showCoords,
                onSelect: showCoords,
                onRelease: clearCoords,
                boxWidth: jcropW,
                boxHeight: jcropH,
                handleSize: isMobile() === 0 ? 28 : 15
            }, function () {
                jcrop = this;
                jcrop.setSelect([130, 65, 130 + 350, 65 + 285]);
                jcrop.setOptions({
                    bgFade: true,
                    bgOpacity: 0.5,
                    bgColor: ‘black‘,
                    addClass: ‘jcrop-light‘,
                    handleOffset: 20
                });
            });

　　　　　　　function showCoords(c) {
                x = c.x;
                y = c.y;
                w = c.w;
                h = c.h;
            };

            function clearCoords() {
                $(‘#coords input‘).val(‘‘);
            };

<button id="btnSaveJcropImg" class="btnJcrop">裁剪</button>

　　　　 /// <summary>
        /// 保存裁剪后的新图片（通过x,y,w,h对原图进行截取）
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <param name="w"></param>
        /// <param name="h"></param>
        /// <param name="fileName">文件名，WebUploader上传到服务器的原图</param>
        /// <returns></returns>
        [HttpPost]
        public JsonResult JcropUploadProcess(int x, int y, int w, int h, string fileName)
        {
            try
            {
                ViewBag.YearEndUploadUrl = yearEndUploadUrl;

                //保存到临时文件夹
                string path = "/upload/yearend/";

                string localPath = HttpContext.Server.MapPath(path);
                if (!System.IO.Directory.Exists(localPath))
                {
                    System.IO.Directory.CreateDirectory(localPath);
                }
                localPath = HttpContext.Server.MapPath(path + "/temp");
                if (!System.IO.Directory.Exists(localPath))
                {
                    System.IO.Directory.CreateDirectory(localPath);
                }

                // 图片路径
                string oldPath = System.IO.Path.Combine(localPath, fileName);
                // 新图片路径
                string newPath = System.IO.Path.GetExtension(oldPath);
                newPath = oldPath.Substring(0, oldPath.Length - newPath.Length) + "_new" + newPath;

                //定义截取矩形
                System.Drawing.Rectangle cropArea = new System.Drawing.Rectangle(x, y, w, h); //要截取的区域大小

                //加载图片
                System.Drawing.Image img = System.Drawing.Image.FromStream(new System.IO.MemoryStream(System.IO.File.ReadAllBytes(oldPath)));

                //定义Bitmap对象
                System.Drawing.Bitmap bmpImage = new System.Drawing.Bitmap(img);

                //进行裁剪
                System.Drawing.Bitmap bmpCrop = bmpImage.Clone(cropArea, bmpImage.PixelFormat);

                //保存成新文件
                bmpCrop.Save(newPath);

                //释放对象
                img.Dispose();
                bmpCrop.Dispose();

                //获取文件名+后缀
                string filePathName = System.IO.Path.GetFileName(newPath);

                return Json(new
                {
                    ret = 0,
                    jsonrpc = "2.0",
                    id = "id",
                    filePath = filePathName,
                    url = yearEndUploadUrl + "temp/" + filePathName
                });
            }
            catch (Exception ex)
            {
                return Json(new { ret = 1, jsonrpc = 2.0, error = new { code = 102, message = ex.Message }, id = "id" });
            }
        }