js 使用递归上传文件（批量上传文件）、上传进度

当接口不支持批量上传，使用递归实现单文件上传，配合mui.loading实现上传进度

var imgAppendixArr = [];//当前已上传的图片信息数组，可传递给后端
//多张图片递归上传
function uploadList(obj, i) {
  var fileList = $("#" + obj.inputId)[0].files;
  var i = i || 0;//初始为0，如i超过数组的下标说明已所有上传完成
  mui.showLoading(
    "正在上传.. (" + (i + 1) + "/" + fileList.length + ")",
    "div"
  );
  if (i > fileList.length - 1) {
    mui.hideLoading();
    msg("上传完成！");
    mui.hideLoading();
    return;
  }

  //用formDate对象上传
  var fd = new FormData();

   fd.append(obj.data, fileList[i]);
  submitPicture(obj.upUrl, fd, function (bat) {
     bat = JSON.parse(bat);
    bat.imgName=fileList[i].name;
    bat.imgSrc=getObjectURL(fileList[i]);
    bat.imgFile=fileList[i];
    obj.cb(bat, obj.filesArr.length );//图片上传成功时执行回调函数，并传递当前成功的图片下标
    ++i;
    uploadList(obj, i);
  });
}
function getObjectURL {
//返回临时图片预览路径
}
function submit(data, cb) {
    $.ajax({
      type: "post",
      url: 'xxxxx',
      data: data,
      success: function (data) {
        cb(data);
      },
    });
}

//批量单张图片文件上传
function imgUploadSingle(obj) {
  var oInput = "#" + obj.inputId;
  $(oInput)
    .unbind()
    .on("change", function () {
      var fileImg = $(oInput)[0];
      var fileList = fileImg.files;

      if (fileList.length > obj.num - obj.filesArr.length) {
        msg("上传失败，超过限制(附件只能上传" + obj.num + "张图片)");
        return false;
      }

      uploadList(obj);
    });
}

   imgUploadSingle({
          inputId: "image", //input框id
          upUrl: 'xxxxxx', //提交地址
          data: "file", //参数名
          num:5, //上传个数
          filesArr: imgAppendixArr,
          cb: function (bat, i) {
        
            if (bat.code == "0") {
              imgAppendixArr.push({
                name: bat.imgName,
                url: bat.data.path,
              });

              var imgDom =
                '    <div class="img-box">    <img onclick="imgDisplay(this)"  alt="' +
                bat.imgName +
                '" src="' +
                bat.imgSrc +
                '" width="100%" height="100"/><div class="img-del" onclick="removeUploadimg(this,' +
                i +
                ')"><span class="mui-icon mui-icon-closeempty" ></span></div></div>';
           
             $(".handle-img-list").append(imgDom); //添加图片预览
              $("#img-sum").text(imgAppendixArr.length);
              if (imgAppendixArr.length == 5) {
                //如图片数足够则隐藏上传按钮
                $(".xxx").hide();
              }
            } else {
              mui.hideLoading();
            }
          },
        });