1.创建数据库连接模块 conn_mongo.js

/**
 * 连接MongoDB数据库
 */
var mongoose=require("mongoose");
mongoose.connect("mongodb://127.0.0.1/mongoose_test",{useMongoClient:true});
mongoose.connection.once("open",function(){
    console.log("数据库连接成功~");
});

2.创建集合的模型 student.js

/**
 * 用来定义Student的模型
 */
var mongoose =require("mongoose");
var Schema=mongoose.Schema;
var stuSchema=new Schema({
    name:String,
    age:Number,
    gender:{//数据类型是String，默认值是 female
        type:String,
        default:"female"
    },
    address:String
});

//定义模型
var StuModel=mongoose.model("students",stuSchema);

//导出
module.exports=StuModel;

3.创建测试模块 index.js

//引入conn_mongo模块连接数据库
require("./conn_mongo");
var Student=require("./models/student");

Student.find({},function(err,docs){
    if(!err){
        console.log(docs);
    }
});