Javascript 模块中的NodeJS必需模块始终未定义

我对后端代码非常陌生。现在，我尝试学习nodeJS服务器的体系结构

我认为我现在的问题很简单，但我无法解决--

server.js（主）：

var io = require("socket.io"),
express = require("express"),
expressHbs = require('express3-handlebars'),
Player = require("./models/Player").Player,
Room = require("./models/Room").Room,
Game = require("./models/Game").Game,
dataSet = require('./data/data.json');
//...

path/path/path/gameserver/models/Room.js:222
var currentPlayer = Player.getPlayer(this.players[player].id);
                           ^
TypeError: Cannot read property 'getPlayer' of undefined

然后我有3个模块：

玩家

房间

游戏

每个模块的结构相同：

Player.js

// importing another module
var Room = require("./Room").Room;

if (!Player.players) {
    Player.players = {};
}

function Player(foo) {
    this.foo = foo;
    Player.players[foo] = this;
}

Player.getAllPlayersAsObject = function () {
    return Player.players;
};
// ...

Player.prototype.removePlayer = function () {
    if (Player.players.hasOwnProperty(this.id)) {
        delete Player.players[this.id];
    }
};
// ...

/**
 * node export
 * @type {Player}
 */
exports.Player = Player;

var Player = require("./Player").Player;

if (!Room.rooms) {
    Room.rooms = {};
}

function Room(foo) {
    this.foo = foo
}

Room.getAllRoomsAsObject = function () {
    return Room.rooms;
};

Room.prototype.toString = function () {
    return JSON.stringify(this);
};

/**
 * node export
 * @type {Room}
 */
exports.Room = Room;

Room.js

// importing another module
var Room = require("./Room").Room;

if (!Player.players) {
    Player.players = {};
}

function Player(foo) {
    this.foo = foo;
    Player.players[foo] = this;
}

Player.getAllPlayersAsObject = function () {
    return Player.players;
};
// ...

Player.prototype.removePlayer = function () {
    if (Player.players.hasOwnProperty(this.id)) {
        delete Player.players[this.id];
    }
};
// ...

/**
 * node export
 * @type {Player}
 */
exports.Player = Player;

var Player = require("./Player").Player;

if (!Room.rooms) {
    Room.rooms = {};
}

function Room(foo) {
    this.foo = foo
}

Room.getAllRoomsAsObject = function () {
    return Room.rooms;
};

Room.prototype.toString = function () {
    return JSON.stringify(this);
};

/**
 * node export
 * @type {Room}
 */
exports.Room = Room;

我的主要问题是，我可以正常使用server.js中的Room、Player、Game-constructor、prototype和所有其他功能

在Player.js中，我也可以正常使用导入的房间模块

Room.js告诉我：

var io = require("socket.io"),
express = require("express"),
expressHbs = require('express3-handlebars'),
Player = require("./models/Player").Player,
Room = require("./models/Room").Room,
Game = require("./models/Game").Game,
dataSet = require('./data/data.json');
//...

path/path/path/gameserver/models/Room.js:222
var currentPlayer = Player.getPlayer(this.players[player].id);
                           ^
TypeError: Cannot read property 'getPlayer' of undefined

我快疯了。我做错了什么？当我在文件顶部对变量“Player”执行console.log（debug）时，我总是没有定义

我在谷歌和stackoverflow上四处走动，没有找到任何解决问题的方法

谢谢，并致以最良好的祝愿

---

Michael

模块之间存在循环依赖关系

你从要求玩家开始。它做的第一件事就是需要空间。房间需要玩家。此时，播放机尚未完成加载。节点通过返回不完整的播放器版本来防止发生无限循环。在这一点上，所有关于将要发生的事情的赌注都没有了

您需要构建模块以避免这种直接循环

循环依赖项的背景信息如下：

这是因为您有一个循环依赖项。