封装了一个基于mysql的 链接数据库，执行sql语句的方法 示例代码： const dbObj = require('itcast-hdj'); dbObj.dbFn('SELECT * FROM student', { host: 'localhost', port: 3306, user: 'root', password: 'root', database: 'practice' },function (res) { console.log(res); }); dbObj.yingyingying();