根据response来判断错误，获取错误信息提示。

//@ts-check
/// <reference path="../types.d.ts" />

export const ERROR_NO_TOKEN_INFO = 10086;
export const ERROR_PASSWD_DIFF = 20488;

/**
 * @param {{code: number, data: any}} response
 */
export function hasError(response) {
  return response && response.code !== 200;
}

/**
 * @param {'default'|'login'|'users'|'roles'|'license'|'upload'|'vendor'|'device'|'park'|'staff'|'dryrun'} category
 * @param {{code: number, data: string}} response
 */
export function getErrorMessage(category, response) {
  try {
    return parse();
  } catch (error) {
    return `未知错误, 服务器返回: ${response.code} 处理异常: ${error.message || error}`;
  }

  function parse() {
    if (!response) response = { code: 0, data: null };
    const responseString =
      typeof response.data === 'string' ? response.data : (JSON.stringify(response.data) || "");
    const responseObject = parseResponse(responseString);

    switch (category) {
      case 'login': {
        if (response.code === 401) return '用户账号或密码错误!';
        break;
      }
      case 'users': {
        // 用户管理等...
        if (response.code === ERROR_PASSWD_DIFF) {
          return '两次密码不相符!';
        } else if (responseString.indexOf('still in use') > 0) {
          return '当前角色仍在使用, 无法删除!';
        } else if (response.code === 400 && responseString.indexOf('already exists') > 0) {
          const mapper = {
            username: "用户名已被占用",
            email: "邮箱已被占用",
            phone: "手机号已被占用",
            empty: "条目已存在",
          };
          return mapper[getConflictField(responseString)];
        }
        break;
      }
      case 'roles': {
        if (response.code === 400 && responseString.indexOf('already exists') > 0)
          return '角色已存在!';
        else if (response.code === 404)
          return (typeof response.data === "string") ? response.data : "请求出错";
        break;
      }
      case 'upload': {
        if (response.code === 409) return '文件已存在, 请上传其他文件!';
        break;
      }
      case 'license': {
        return '生成授权信息出错!';
        break;
      }
      case 'dryrun': {
        if (responseString.indexOf('still in use') > 0) {
          return '所选的试运行记录与点检任务已关联, 无法删除!';
        } else if (responseString.indexOf("unresolved fault") > 0) {
          return '该设备存在故障，无法开始试运行!';
        }
        break;
      }
      default: {
        if (response.code === ERROR_PASSWD_DIFF) return '两次密码不相符!';
      }
    }

    if (response.code === 403) return '暂无访问权限!';
    if (response.code === 404) return '条目不存在!';
    if (response.code === 409) return '条目已存在!';
    if (response.code === 413) return '文件过大!';
    if (response.code === 500) return '服务器内部错误';

    return responseObject.message || '未知服务器错误';
  }
}

function parseResponse(data) {
  if (typeof data === 'object') return data;
  if (typeof data !== 'string') return {};
  try {
    return JSON.parse(data);
  } catch (error) {
    return {};
  }
}

function getConflictField(data) {
  return /field":"(.*)"/.test(data) ? data.match(/field":"(.*)"/)[1] : "empty";
}

使用：

  one rror(error) { this.setState({ error: getErrorMessage('default', error) }); }
  one rrorInModal(error) { this.setState({ errorInModal: getErrorMessage('default', error) }); }