vue new一个表单对象

    /**
* 上传附件请求方法
*/
    imgUpload_data (files) {
      let areaId = sessionStorage.getItem('areaId') || ''
      let param = new FormData()
      param.append('module', 'materiainfoFile')
      param.append('siteId', JSON.parse(areaId))
      param.append('attachment', files.file)
      this.$api.proposal.proposalfile(param).then(res => {
        var { data } = res
        data[0].name = data[0].fileName
        this.fileData.push(data[0])
      })
    },