.前端页面代码

 /**

 * 通过图片本地路径获取图片真实大小，并进行压缩

 */

 function getLocalRealSize(path, callback) {

     var img = new Image();

     var tempimg = new Image();

     img.src = path;

     img.onload = function() {

         var height = img.naturalHeight;

         var width = img.naturalWidth;

         img.width = img.naturalWidth;

         img.height = img.naturalHeight;

         //压缩图片

         var canvas = compressImage(img);

         tempimg = canvas.toDataURL('image/jpeg');

         callback(tempimg);

     }

 };

 /**

 * 压缩图片

 */

 function compressImage(image) {

         var canvas = document.createElement("canvas");

         var mwidth = image.width;

         var mheight = image.height;

         var scale = ;

         var i = ;

         while (true) {

             if (mwidth >> i <=  && mheight >> i <= ) {

                 scale = Math.pow(0.5, i);

                 break;

             }

             i += ;

         }

         canvas.width = mwidth * scale;

         canvas.height = mheight * scale;

         canvas.getContext("2d").drawImage(image, , , mwidth * scale, mheight * scale);

         return canvas;

     }

     //主页面   车主首页    跳转

     document.getElementById("driverindex").addEventListener("tap", function() {

         //获取img对象

         var OwerImg = document.getElementById("owner-photo-img");

         var OwerCardImg = document.getElementById("owner-cardphoto-img");

         var OwerLicenceImg = document.getElementById("owner-driver1-img");

         var OwerDrivingLicenceImg = document.getElementById("owner-driver2-img");

         var CarImg = document.getElementById("owner-car-img");

         var AssuranceImg = document.getElementById("owner-sure-img");

         var oArray=source.split("|");

         var totalCount=imgCount+oArray.length-;

         if(totalCount<){

             mui.toast("请上传完整信息");

             return false;

         }

         uploadImg();

     });

 });

 // 上传文件

 var uploadImg = function() {

     var server = imgUrl+'/clientapi/driver/ApplayCertification';

     //outSet("开始上传：")

     var wt = plus.nativeUI.showWaiting();

     var task = plus.uploader.createUpload(server, {

             method: "POST",

             blocksize: ,

             priority:

         },

         function(t, status) { //上传完成

             if (t.state ==  && status == ) {

                 wt.close();

                 //outLine("上传成功：" + t.responseText);

                 //上传成功，跳转到车主首页

                 mui.toast('上传成功');

                 mui.fire(mycarPage, "pageflowrefresh" );

                 plus.webview.currentWebview().close();

                 mui.redirect('myaccount-mycar', '../myaccount/mycar.html');

             } else {

                 //outLine("上传失败：" + status);

                 wt.close();

                 mui.toast('上传失败');

             }

         }

     );

     task.addData("token", UserInfo.token());

     task.addData("source", source);

     task.start();

 }

 .C#后台代码

  //将base64编码的字符串转为图片并保存

 protected string SaveBase64Image(string source, string path, int userID)

 {

     try

     {

         var now = DateTime.Now;

         string filePath = path + now.ToString("yyyy-MM-dd") + "/" + userID.ToString() + "/";

         string fileName = now.ToString("yyyyMMddhhmmssffff") + ".jpg";

         Log.Debug("filePath:" + filePath + fileName);

         string strbase64 = source.Substring(source.IndexOf(',') + );

         strbase64 = strbase64.Trim('\0');

         //Log.Debug("strbase64:" + strbase64);

         byte[] arr = Convert.FromBase64String(strbase64);

         using (MemoryStream ms = new MemoryStream(arr))

         {

             Log.Debug("进入了MemoryStream");

             Bitmap bmp = new Bitmap(ms);

             if (!Directory.Exists(Server.MapPath(filePath)))

             {

                 Log.Debug("没有Directory");

                 Directory.CreateDirectory(Server.MapPath(filePath));

             }

             //if (!Directory.Exists(filePath))

             //    Log.Debug("没有Directory");

             //Directory.CreateDirectory(filePath);

             //新建第二个bitmap类型的bmp2变量。

             Bitmap bmp2 = new Bitmap(bmp, bmp.Width, bmp.Height);

             //将第一个bmp拷贝到bmp2中

             Graphics draw = Graphics.FromImage(bmp2);

             draw.DrawImage(bmp, , );

             draw.Dispose();

             Log.Debug("保存图片前");

             bmp2.Save(Server.MapPath(filePath + fileName), System.Drawing.Imaging.ImageFormat.Jpeg);

             Log.Debug("保存图片后");

             //bmp.Save("test.bmp", ImageFormat.Bmp);

             //bmp.Save("test.gif", ImageFormat.Gif);

             //bmp.Save("test.png", ImageFormat.Png);

             ms.Close();

             return filePath + fileName;

         }

     }

     catch (Exception ex)

     {

         return null;

     }

 }