文件上传，显示进度条

    async httpRequest(param) {
      let formData = new FormData()
      formData.append('file', param.file)
      const config = {
        onUploadProgress: progressEvent => {
          this.progress = Number(
            ((progressEvent.loaded / progressEvent.total) * 100).toFixed()
          )
        }
      }
      const { viewPath } = await FileUpload(formData, config)
      this.$message.success('脚本文件上传成功')
      this.form.kettlePath = viewPath
    },

import request from '@/plugin/axios'

const BASE_URL = 'sys/file'

export function FileUpload(data, config) {
  return request({
    url: BASE_URL + '/upload',
    method: 'post',
    data,
    headers: { 'Content-Type': 'multipart/form-data' },
    ...config
  })
}