vue+element ui上传文件,显示的文件参数内容只有uid问题及解决

<el-dialog title="上传文件" :visible.sync="dialogFormVisible1" class="dia">
              <el-upload ref="upload"  class="upload-demo" drag
                action="https://jsonplaceholder.typicode.com/posts/" multiple
                :on-preview="handlePreview"
                :file-list="fileList" :limit="1"
                :on-exceed="exceed" :auto-upload="false"
                :http-request="handleHttpRequest" :on-change="handleChange"  >
	                <div>
	                	<i class="el-icon-upload"></i>
	                </div>
	                <div class="el-upload__text">
	                  将文件拖到此处，或<em>点击上传</em>
	                </div>
              </el-upload>
              <el-button
                style="margin-top: 20px"
                size="small"
                type="primary"
                @click="submitUpload"
                >上传到服务器</el-button
              >
        </el-dialog>

handleHttpRequest(param) {
      if(this.fileStatus == 200){
        var formData = new FormData();
        formData.append('file', param.file);
        formData.append('md5', this.mode.md5);
        formData.append('sha1', this.mode.sha1);
        formData.append('fileName', this.mode.fileName);
        formData.append('fileID', this.mode.fileID);
        formData.append('token', this.mode.token);
        formData.append('createTime', this.mode.createTime);
        formData.append('size', this.mode.size);
        getUpload(this.url, formData)
          .then((res) => {
            if (res.data.returnCode == 0) {
              this.dialogFormVisible1 = false;              
              this.init_1();
              this.fileList = null;
              return this.$message.success("上传成功");
            } else {
              this.dialogFormVisible1 = false;
              return this.$message.error(res.data.errMessage);
            }
          })
          .catch((err) => {
            this.dialogFormVisible1 = false;
            return this.$message.error("请求失败！");
          });
      }else if(this.fileStatus == 201 || this.fileStatus == 202){
        this.dialogFormVisible1 = false;
        return this.$message.success("上传成功");
      }else{
        this.dialogFormVisible1 = false;
        return this.$message.error("文件上传实际路径请求失败！");
      }
    },

submitUpload() {
  this.$refs.upload.submit();
},

npm install --save js-base64

cnpm install --save js-base64

//在需要使用base64的组件中
let Base64 = require('js-base64').Base64;
const en = Base64.encode(file)//加密
const de= Base64.decode(en);//解密