export function GetDownload (obj) {  //乱码配置下载
  return request({
    responseType:'arraybuffer',   //解决乱码配置**
    url: '/xxx',
    method: 'post',
    data: obj
  })
}

//用下载插件下载
import fileDownload from 'js-file-download';
api.GetDownload(param).then(res => {
          fileDownload(res,'下载名称');
      })