// 分页修改中间件
module.exports = () => {
  return (req, res, next) => {
    const { page } = req.query;
    if (page !== undefined) {
      req.query.page = parseInt(page) ? parseInt(page) - 1 : 0;
    }
    for (const i in req.query) {
      if (req.query[i] === '') {
        delete req.query[i];
      }
    }
    next();
  };
};