H5 mobile phone image upload plug-in code

(function ($) {
 $.extend($, {
 fileUpload: function (options) {
  var para = {
  multiple: true,
  filebutton: ".filePicker",
  uploadButton: null,
  url: "/home/MUploadImg",
  filebase: "mfile",//mvc后台需要对应的名称
  auto: true,
  previewZoom: null,
  uploadComplete: function (res) {
   console.log("uploadComplete", res);
  },
  uploadError: function (err) {
   console.log("uploadError", err);
  },
  onProgress: function (percent) { // 提供给外部获取单个文件的上传进度，供外部实现上传进度效果
   console.log(percent);
  },
  };
  para = $.extend(para, options);

  var $self = $(para.filebutton);
  //先加入一个file元素
  var multiple = ""; // 设置多选的参数
  para.multiple ? multiple = "multiple" : multiple = "";
  $self.css('position', 'relative');
  $self.append(&#39;<input id="fileImage" style="opacity:0;position:absolute;top: 0;left: 0;width:100%;height:100%" type="file" size="30" name="fileselect[]" &#39; + multiple + &#39;>&#39;);

var doms = {
  "fileToUpload": $self.parent().find("#fileImage"),
  // "thumb": $self.find(".thumb"),
  // "progress": $self.find(".upload-progress")
  };
  var core = {
  fileSelected: function () {
   var files = (doms.fileToUpload)[0].files;
   var count = files.length;
   console.log("共有" + count + "个文件");
   for (var i = 0; i < count; i++) {
   var item = files[i];
   console.log(item.size);
   if (para.auto) {
    core.uploadFile(item);
   }
   core.previewImage(item);
   }
  },

  uploadFile: function (file) {
   console.log("开始上传");
   var formdata = new FormData();

   formdata.append(para.filebase, file);//这个名字要和mvc后台配合

   var xhr = new XMLHttpRequest();
   xhr.upload.addEventListener("progress", function (e) {

   var percentComplete = Math.round(e.loaded * 100 / e.total);
   para.onProgress(percentComplete.toString() + &#39;%&#39;);
   });
   xhr.addEventListener("load", function (e) {
   para.uploadComplete(xhr.responseText);
   });
   xhr.addEventListener("error", function (e) {
   para.uploadError(e);
   });

   xhr.open("post", para.url, true);
   //xhr.setRequestHeader("X_FILENAME", file.name);
   xhr.send(formdata);
  },
  uploadFiles: function () {
   var files = (doms.fileToUpload)[0].files;
   for (var i = 0; i < files.length; i++) {
   core.uploadFile(files[i]);
   }
  },
  previewImage: function (file) {
   if (!para.previewZoom) return;
   var img = document.createElement("img");
   img.file = file;
   $(para.previewZoom).append(img);
   // 使用FileReader方法显示图片内容
   var reader = new FileReader();
   reader.onload = (function (aImg) {
   return function (e) {
    aImg.src = e.target.result;
   };
   })(img);
   reader.readAsDataURL(file);
  }
  }
  doms.fileToUpload.on("change", function () {
  //doms.progress.find("span").width("0");
  console.log("选中了文件");
  core.fileSelected();
  });

  console.log("初始化!");
  //绑定事件

  $(document).on("click", para.filebutton, function () {
  console.log("clicked");
  //doms.fileToUpload.click();
  });
  if (para.uploadButton) {
  $(document).on("click", para.uploadButton, function () {
   core.uploadFiles();
  });
  }
 }
 });
})(Zepto);

 [HttpPost]
 public ActionResult MUploadImg(HttpPostedFileBase mfile)
 {
  return UploadImg(mfile, "Mobile");
 }

 [HttpPost]
 public ActionResult UploadImg(HttpPostedFileBase file, string dir = "UserImg")
 {
  if (CheckImg(file, imgtypes) != "ok") return Json(new { Success = false, Message = "文件格式不对！" }, JsonRequestBehavior.AllowGet);

  if (file != null)
  {
  var path = "~/Content/UploadFiles/" + dir + "/";
  var uploadpath = Server.MapPath(path);
  if (!Directory.Exists(uploadpath))
  {
   Directory.CreateDirectory(uploadpath);
  }
  string fileName = Path.GetFileName(file.FileName);// 原始文件名称
  string fileExtension = Path.GetExtension(fileName); // 文件扩展名
  //string saveName = Guid.NewGuid() + fileExtension; // 保存文件名称 这是个好方法。
  string saveName = Encrypt.GenerateOrderNumber() + fileExtension; // 保存文件名称 这是个好方法。
  file.SaveAs(uploadpath + saveName);

  return Json(new { Success = true, SaveName = path + saveName });
  }
  return Json(new { Success = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);

 }

<p class="page" id="upload">
 <h2>UploadImg</h2>
 <p id="dd" class="filePicker">点击选择文件</p>
 <p id="preview"></p>
</p>
<script>
 $.fileUpload({ filebutton: "#dd", previewZoom: "#preview" });
</script>