import request from '@/utils/request';

export async function Download(params = {}) {
 return request(`/api/download`, {
  method: 'POST', // GET / POST 均可以
  data: params,
  responseType : 'blob', // 必须注明返回二进制流
 });
}

import { message } from 'antd';
import { Download } from '@/services/api';

export default {
  namespace: 'download',
  
  state: {},
  
  effects: {
    *download({ payload, callback }, { call }){
      const response = yield call(Download, payload);
      if (response instanceof Blob) {
        if (callback && typeof callback === 'function') {
           callback(response);
        }
      } else {
        message.warning('Some error messages...', 5);
      }
    }
  },
  
  reducers: {},
}

import React, { Component } from 'react';
import { Button } from 'antd';
import { connect } from 'dva';

@connect(({ download, loading }) => ({
 download,
 loading: loading.effects['download/download'],
}))
class ExampleDownloadPage extends Component {
  handleDownloadClick = e => {
    e.preventDefault();
    const { dispatch } = this.props;
    const fileName = 'demo.xlsx';
    
    dispatch({
      type: 'download/download',
      payload: {}, // 根据实际情况填写参数
      callback: blob => {
        if (window.navigator.msSaveOrOpenBlob) {
          navigator.msSaveBlob(blob, fileName);
        } else {
          const link = document.createElement('a');
          const evt = document.createEvent('MouseEvents');
          link.style.display = 'none';
          link.href = window.URL.createObjectURL(blob);
          link.download = fileName;
          document.body.appendChild(link); // 此写法兼容可火狐浏览器
          evt.initEvent('click', false, false);
          link.dispatchEvent(evt);
          document.body.removeChild(link);
        }
      }
    });
  }
  
  render(){
    const { loading } = this.props;
    
    return <Button 
          loading={loading} 
          icon="download" 
          onClick={this.handleDownloadClick}
        >
         下载
        </Button>;
  }
}