text: import fetch from 'dva/fetch';
  import { notification } from 'antd';
  import router from 'umi/router';
  
  import { setAuthorization, getAuthorization } from '@/utils/authority';
  
  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。',
  };
  
  const 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;
  };
  
  /**
   *********************************************************
   ** @desc ： json对象转换成FormData，方便后台接收
   ** @author Pings
   ** @date   2019/1/26
   ** @param  json      需要转换的json对象
   ** @return FormData
   * *******************************************************
   */
  const toFormData = json => {
    const formData = new FormData();
    Object.keys(json).forEach(key => {
      formData.append(key, json[key]);
    });
    return formData;
  };
  
  /**
   * Requests a URL, returning a promise.
   *
   * @param  {string} url       The URL we want to request
   * @param  {object} [option] The options we want to pass to "fetch"
   * @return {object}           An object containing either "data" or "err"
   */
  export default function request(url, option) {
    /**
     * Produce fingerprints based on url and parameters
     * Maybe url has the same parameters
     */
    if (
      option &&
      (option.method === 'POST' || option.method === 'PUT' || option.method === 'DELETE')
    ) {
      //**转换参数为FormData */
      if (option.body && !(option.body instanceof FormData)) {
        option.body = toFormData(option.body);
      }
    } else if (option) {
      //**转换参数为test?a=1&b=2*/
      option =
        typeof option === 'object'
          ? Object.keys(option)
              .filter(key => option[key])
              .map(key => `${key}=${option[key]}`)
              .join('&')
          : option;
      url = `${url}?${option}`;
      option = null;
    }
  
    if (option) {
      option.headers = { Accept: 'application/json', ...option.headers };
    } else {
      option = { headers: { Accept: 'application/json' } };
    }
  
    //**添加权限标记token */
    let token = getAuthorization();
    //**是否是登出系统
    const isLogout = url.search('login/logout') !== -1;
    if (token && !isLogout) option.headers.Authorization = token;
  
    return fetch(url, option)
      .then(checkStatus)
      .then(response => {
        token = response.headers.get('Authorization');
        if (token) {
          //**设置token权限标记
          setAuthorization(token);
        }
  
        return response.json();
      })
      .catch(e => {
        const status = e.name;
        if (status === 401) {
          // @HACK
          /* eslint-disable no-underscore-dangle */
          window.g_app._store.dispatch({
            type: 'login/logout',
          });
          return;
        }
        // environment should not be used
        if (status === 403) {
          router.push('/exception/403');
          return;
        }
        if (status <= 504 && status >= 500) {
          router.push('/exception/500');
          return;
        }
        if (status >= 404 && status < 422) {
          router.push('/exception/404');
        }
      });
  }
  