ElementUI中的上传组件在表单中携带其它值提交表单后一起传到后端
例：

      <el-form :model="submitForm"   label-width="60px">
        <el-form-item label="性别">
          <el-radio-group v-model="submitForm.name">
            <el-radio label="男"></el-radio>
            <el-radio label="女"></el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="头像" ref="uploadElement" prop="imageUrl">
          <el-input v-model="submitForm.imageUrl" v-if="false"></el-input>
          <el-upload
              class="avatar-uploader"
              ref="upload"
              :show-file-list="false"
              :before-upload="beforeUpload"
              :on-change="handleChange"
              :auto-upload="false"
              :data="submitForm">
            <img v-if="submitForm.imageUrl" :src="submitForm.imageUrl" class="avatar">
            <i v-else class="el-icon-plus avatar-uploader-icon"></i>
          </el-upload>
        </el-form-item>
        <el-form-item>
          <el-button type="primary" @click="submit()">提交</el-button>
        </el-form-item>
        <el-image :src="this.resultUrl" v-if="resultP"></el-image>
      </el-form>

  methods: {
    submit() {
      this.$refs.upload.submit();
    },
    handleChange (file, fileList) {
      this.submitForm.imageUrl = URL.createObjectURL(file.raw);
    },
    beforeUpload(file) {
      let fd = new FormData()
      fd.append('file', file)
      fd.append('name', this.submitForm.name)
      postAction(fd).then(res => {
        if (res.status === 200){
        //返回结果业务处理
        }
      })
      return true;
    },
  },

export function postAction (data) {
  return axios({
    method: 'post',
    url: '',
    timeout: 20000,
    data: data 
  })
}