插入接口：insertStudent 功能： 以学号为key，插入学生的信息

查询接口：queryStudent 功能： 根据query参数中提供的学号来查询学生信息

Run create note info

URLconvert Convert the path in the database into a complete url accessible by the front end

* Returns the offset parent of the given element * @method * @memberof Popper.Utils * @argument {Element} element * @returns {Element} off

CheckUserExistById find if user exists

QueryUser query User by user_name

add k & v to redis

check the set of k if exist

count get the size of the set of key

* Create key-value caches of limited size * @returns {function(string, object)} Returns the Object data after storing it on itself with * property n

del k & v

exist check the relation k and v if exist

* Get the opposite placement of the given one * @method * @memberof Popper.Utils * @argument {String} placement * @returns {String} flippe

* Returns the scrolling parent of the given element * @method * @memberof Popper.Utils * @argument {Element} element * @returns {Element}

IsJSONType method is to check JSON content type or not

IsXMLType method is to check XML content type or not