项目场景：

在后台管理系统上传图片时，使用自定义的上传方法

---

问题描述

用element-ui + vue2.0上传多张图片，并使用自定义方法时，无法获取上传进度和上传完成后的图片列表，想要获取上传完成之后的列表

<el-upload :action="actionUrl"
                     multiple
                     ref="uploadPic"
                     accept="image/jpeg, image/png, image/jpg"
                     list-type="picture-card"
                     :http-request="(e) => {uploadFile(e, row)}"
                     :on-success="(response, file, fileList) => {uploadSuccess(fileList, row)}"
                     :on-remove="(file, fileList) => {removeFileList(fileList, row)}"
                     :file-list="row.imageCos || []"
          >
    <i class="el-icon-plus"></i>
 </el-upload>

	uploadFile({file, onProgress, onSuccess, beforeUpload}, row) {
      uploadPic(file, progress => {
        onProgress(progress)
      }).then(res => {
        onSuccess({
          name: res.name,
          url: res.url,
        })
      })
    },
    uploadSuccess(fileList, row) {
      this.$set(row, 'imageCos', fileList)
    },
    removeFileList(fileList, row) {
      this.$set(row, 'imageCos', fileList)
    },

---

原因分析：

看el-upload的源码得知，在自定义的http-request的函数中，有以下几个传参

post(rawFile) {
      const { uid } = rawFile;
      const options = {
        headers: this.headers,
        withCredentials: this.withCredentials,
        file: rawFile,
        data: this.data,
        filename: this.name,
        action: this.action,
        onProgress: e => {
          this.onProgress(e, rawFile);
        },
        onSuccess: res => {
          this.onSuccess(res, rawFile);
          delete this.reqs[uid];
        },
        onError: err => {
          this.onError(err, rawFile);
          delete this.reqs[uid];
        }
      };
      const req = this.httpRequest(options);
      this.reqs[uid] = req;
      if (req && req.then) {
        req.then(options.onSuccess, options.onError);
      }
    },

headers、file、filename、data、action、onProgress、onSuccess、onError这几个参数可以获取，调用onProgress和onSuccess就可以实现上传进度和上传成功监听

---

解决方案：

上传时调用onPressgress回调，上传成功后调用onSuccess回调，在调用el-upload on-success属性，获取上传成功的列表。

<el-upload :action="actionUrl"
                     multiple
                     ref="uploadPic"
                     accept="image/jpeg, image/png, image/jpg"
                     list-type="picture-card"
                     :http-request="(e) => {uploadFile(e, row)}"
                     :on-success="(response, file, fileList) => {uploadSuccess(fileList, row)}"
                     :on-remove="(file, fileList) => {removeFileList(fileList, row)}"
                     :file-list="row.imageCos || []"
          >
    <i class="el-icon-plus"></i>
 </el-upload>

uploadFile({file, onProgress, onSuccess, beforeUpload}, row) {
      uploadPic(file, progress => {
        onProgress(progress)
      }).then(res => {
        onSuccess({
          name: res.name,
          url: res.url,
        })
      })
    },
    uploadSuccess(fileList, row) {
      this.$set(row, 'imageCos', fileList)
    },
    removeFileList(fileList, row) {
      this.$set(row, 'imageCos', fileList)
    },