Node中 mongoose報錯：TypeError: schema is not a constructor？

問題描述

用mongoose創(chuàng)建了一個學(xué)生Schame，但是運(yùn)行的時候報錯，錯誤在第三行的Schema；

TypeError: schema is not a constructor

看了代碼沒找到錯，請大家?guī)兔纯?，謝謝！

相關(guān)代碼

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;
const courseInf = new Schema({
    teacher:String,
    courseName:String
});
const student = new Schema({
    name:String,                //姓名
    class:String,                //班級
    stunum:String,                //學(xué)號
    oldpassword:String,           //舊密碼
    newpassword:String,           //新密碼
    phonenum:String,              //手機(jī)號
    course:[courseInf]           //課程
});

module.exports.stu = mongoose.model('student',student);