student.js

function add(student){
   console.log("Add Students"+student);
   exports.add=add;
}

/**************************************/

teacher.js

function add(teacher){
   console.log("Add Teacher"+teacher);
   exports.add=add;
}

/**************************************/

classes.js

var student=require("./student");
var teacher=require("./teacher");
function add(teacherName,students){
   teacher.add(teacherName);
   students.forEach(function(item,index){
       student.add(item)
   })
}
exports.add=add;

/*************************************/

index.js

var classes=require("./classes");
classes.add("Scott",["白富美","高富帅"]);