egg 插件加载不进来?

我修改了这俩个文件配置,并没有this.app.redis啊. 是还需要修改什么其他的么? ${app_root}/config/plugin.js

exports.redis = {
  enable: true,
  package: 'egg-redis',
};

${app_root}/config/config.default.js

'use strict';

module.exports = appInfo => {
  const config = exports = {};

  // use for cookie sign key, should change to your own and keep security
  config.keys = appInfo.name + '_1522295196003_1293';

  // add your config here
  config.middleware = [];
  config.redis = {
    client: {
      port: xx,          // Redis port
      host: '192.168.19.xx',   // Redis host
      password: '',
      db: 0,
    },
  }
  return config;
};