response，二进制文件流下载

• responseType: 'blob'

export function downloadNewProduct(parameter) {

  return axios({
    url: api.downloadNewProduct,
    method: 'post',
    responseType: 'blob',
    data: parameter
  });
}

• 转blob创建URL对象

 let a = document.createElement('a');
let url = window.URL.createObjectURL(new Blob([res]));
// 创建url对象
 a.href = url;
 a.download = '测试.xlsx';
 a.click();
// 释放url对象
 window.URL.revokeObjectURL(url);