// 跨域中间件
module.exports = (DOMAIN = '*') => {
  return (req, res, next) => {
    res.set('Access-Control-Allow-Headers', req.headers['access-control-request-headers']);
    res.header('Access-Control-Allow-Origin', req.headers.origin);
    res.header('Access-Control-Allow-Credentials', 'true');
    res.header('Access-Control-Allow-Methods', 'PUT,POST,GET,DELETE,OPTIONS');
    next();
  };
};