text: import fetch from 'dva/fetch';
  import { notification } from 'antd';
  import { routerRedux } from 'dva/router';
  import store from '../index';
  
  const codeMessage = {
    200: '服务器成功返回请求的数据。',
    201: '新建或修改数据成功。',
    202: '一个请求已经进入后台排队（异步任务）。',
    204: '删除数据成功。',
    400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
    401: '用户没有权限（令牌、用户名、密码错误）。',
    403: '用户得到授权，但是访问是被禁止的。',
    404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
    406: '请求的格式不可得。',
    410: '请求的资源被永久删除，且不会再得到的。',
    422: '当创建一个对象时，发生一个验证错误。',
    500: '服务器发生错误，请检查服务器。',
    502: '网关错误。',
    503: '服务不可用，服务器暂时过载或维护。',
    504: '网关超时。',
  };
  function checkStatus(response) {
    if (response.status >= 200 && response.status < 300) {
      return response;
    }
    const errortext = codeMessage[response.status] || response.statusText;
    notification.error({
      message: `请求错误 ${response.status}: ${response.url}`,
      description: errortext,
    });
    const error = new Error(errortext);
    error.name = response.status;
    error.response = response;
    throw error;
  }
  
  /**
   * Requests a URL, returning a promise.
   *
   * @param  {string} url       The URL we want to request
   * @param  {object} [options] The options we want to pass to "fetch"
   * @return {object}           An object containing either "data" or "err"
   */
  export default function request(url, options) {
    const defaultOptions = {
      credentials: 'include',
    };
    // 登录url不校验是否成功认证
    if (url !== '/user/login/') {
      defaultOptions['X-Requested-With'] = 'XMLHttpRequest';
    }
    const newOptions = { ...defaultOptions, ...options };
    if (
      newOptions.method === 'POST' ||
      newOptions.method === 'PUT' ||
      newOptions.method === 'DELETE' ||
      newOptions.method === 'PATCH'
    ) {
      if (!(newOptions.body instanceof FormData)) {
        newOptions.headers = {
          Accept: 'application/json',
          'Content-Type': 'application/json; charset=utf-8',
          ...newOptions.headers,
        };
        newOptions.body = JSON.stringify(newOptions.body);
      } else {
        // newOptions.body is FormData
        newOptions.headers = {
          Accept: 'application/json',
          ...newOptions.headers,
        };
      }
    }
  
    return fetch(url, newOptions)
      .then(checkStatus)
      .then(response => {
        if (newOptions.method === 'DELETE' || response.status === 204) {
          return response.text();
        }
        return response.json();
      })
      .catch(e => {
        const { dispatch } = store;
        const status = e.name;
        if (status === 401) {
          dispatch({
            type: 'login/logout',
          });
          return;
        }
        if (status === 403) {
          dispatch(routerRedux.push('/exception/403'));
          return;
        }
        if (status <= 504 && status >= 500) {
          dispatch(routerRedux.push('/exception/500'));
          return;
        }
        if (status >= 404 && status < 422) {
          dispatch(routerRedux.push('/exception/404'));
        }
      });
  }
  