ElementUI中，利用upload组件手动提交多个文件报错

Question

<el-form-item label="附件：">

        <el-upload
          class="upload-demo"
          :action="uploadUrl"
          :on-preview="handlePreview"
          :on-remove="handleRemove"
          :on-success="uploadSuccess"
          :before-remove="beforeRemove"
          :limit="1"
          :on-exceed="handleExceed"
          :file-list="fileList"
          :data="uploadObj"
          :headers="headers"
          ref="upload"
          :auto-upload="false"
        >
          <el-button size="small">点击上传</el-button>
          <div
            slot="tip"
            class="el-upload__tip col999"
          >支持扩展名：rar. zip. doc. docx. pdf. jpg…</div>
        </el-upload>
      </el-form-item
       <el-form-item>
        <el-button
          type="primary"
          @click="saveSonTask"
          size="small"
        >确定</el-button>
      </el-form-item>

手动上传文件，在点击确定按钮的时候我们在进行文件的上传

相关代码

  let formData = new FormData();
  formData.append("file", _this.fileList); //将上传的数组放在这里
  formData.append("concent", _this.form.taskDec); //任务表述
  formData.append("planstartdate", _this.form.timeQuantum[0]); //任务开始日期
  formData.append("planenddate", _this.form.timeQuantum[1]); //任务结束日期
  formData.append("taskgrade", _this.form.referenceScore); //任务得分
  formData.append("deptId", _this.form.dutyDep); //部门id
  formData.append("deptName", _this.sonTaskDepAry[0].deptName); //部门名称
  formData.append("memo", _this.form.memo); //备注
  formData.append("principalId", _this.form.taskTopName); //负责人id
  formData.append("principalName", _this.principalName); //负责人名称
  formData.append("study", _this.form.learnTask === "是" ? true : false); //是否是学习任务
  formData.append("urgency", _this.form.ifNow === "是" ? true : false); //是否紧急
  formData.append("budget", _this.form.linkBudget === "是" ? true : false); //是否预算
  formData.append("projectplanId", _this.plan_id); //项目id
  formData.append("parentId", _this.rowData.id); //子任务需要传递一个父级id
  // 这里我们循环将需要的数据传递给后台
  for (let i = 0; i < this.selectTaglist.length; i++) {
    const element = this.selectTaglist[i];
    formData.append("labelId[" + i + "].grade", element.grade);
    formData.append("labelId[" + i + "].id", element.id);
    formData.append("labelId[" + i + "].name", element.name);
  }
  _this.uploadFileRequest("project-plan/task/save", formData, function(
    data
  ) {
    console.log(data);
    if (data.data.code == "406") {
      _this.sonTaskDialog = false;
      _this.$message({
        message: data.data.message,
        type: "warning"
      });
      return;
    }
    _this.sonTaskDialog = false;
    _this.$message({
      message: "保存成功",
      type: "success"
    });
   //封装的axios
   export const uploadFileRequest = (url, params,fun) => {
          return axios({
            method: 'post',
            url: `${base}${url}`,
            data: params,
            headers: {
              'Content-Type': 'multipart/form-data',
              'authorization': sessionStorage.getItem('principal'),
              'token': sessionStorage.getItem('token')
            }
          }).then(data=>{
            fun(data)
          })
        }

控制台

文件应该是以流的形式传递的啊？怎么会变成[object,object]

Answer 1

for(var i = 0 ; i < _this.fileList.length; i++) {
       formData.append(file, _this.fileList[i])
}

一个个append,不要append数组