post请求下载文件，获取Content-Disposition文件名

1、post下载文件代码，doload方法

import request from "../../src/utils/request";
import { API } from "../../constants/API";
import axios from "axios"
import { Modal } from "antd";
/**
 * 生成CSR
 * @param {*} data
 */
export function getCsr(data) {
    return request(API.GET_CSR, { data });

  }
export function download(url, params, fileName) {
    return new Promise((resolve, reject) => {
        axios.post(
            url,
            {...params},
            {responseType: 'blob'}
        )
        .then(res => {
            let reader = new FileReader();
            let data = res.data;
            reader.onload = e => {
                if (e.target.result.indexOf('Result') != -1 && JSON.parse(e.target.result).Result == false) {
                    // 进行错误处理
                } else {
                    if (!fileName) {
                        let contentDisposition = res.headers['content-disposition'];
                        if (contentDisposition) {
                            fileName = window.decodeURI(res.headers['content-disposition'].split('=')[1], "UTF-8");
                        }
                    }
                    executeDownload(data, fileName);
                }
            };
            reader.readAsText(data);
            resolve(res.data);
        })
    });
}
export function executeDownload(data, fileName) {
  if (!data) {
      return
  }
  let url = window.URL.createObjectURL(new Blob([data]));
  let link = document.createElement('a');
  link.style.display = 'none';
  link.href = url;
  link.setAttribute('download', fileName);
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  Modal.success({
    title: "操作成功",
    okText:"确定",
    content: "生成CSR成功！请注意下载文件！",
    onOk: () => {}
  })
}

2、如何获取后端传过来的名字，后端需要设置如下：

Access-Control-Expose-Headers : 'Content-Disposition'

3、注意点后台Content-Disposition，需要配合 application/octet- stream