JavaScript设计模式之中介者模式详解

function Player(name) {
	this.name = name
	this.enemy = null; // 敌人
};
Player.prototype.win = function () {
	console.log(this.name + ' won ');
};
Player.prototype.lose = function () {
	console.log(this.name + ' lost');
};
Player.prototype.die = function () {
	this.lose();
	this.enemy.win();
};

const player1 = new Player('玩家一');
const player2 = new Player('玩家二');

player1.enemy = player2; 
player2.enemy = player1;

player1.die();// 输出：玩家一 lost、玩家二 won 

player1.partners = [player1, player2, player3, player4];
player1.enemies = [player5, player6, player7, player8];
Player5.partners = [player5, player6, player7, player8];
Player5.enemies = [player1, player2, player3, player4];

const players = []; 

function Player(name, teamColor) {
	this.partners = []; // 队友列表
	this.enemies = []; // 敌人列表
	this.state = 'live'; // 玩家状态
	this.name = name; // 角色名字
	this.teamColor = teamColor; // 队伍颜色
};

Player.prototype.win = function () { // 玩家团队胜利
	console.log('winner: ' + this.name);
};
Player.prototype.lose = function () { // 玩家团队失败
	console.log('loser: ' + this.name);
};

Player.prototype.die = function () { // 玩家死亡
	let all_dead = true;
	this.state = 'dead'; // 设置玩家状态为死亡
	for (let i = 0; i < this.partners.length; i++) { // 遍历队友列表
		if (this.partners[i].state !== 'dead') { // 如果还有一个队友没有死亡，则游戏还未失败
			all_dead = false;
			break;
		}
	}
	if (all_dead === true) { // 如果队友全部死亡
		this.lose(); // 通知自己游戏失败
		for (let i = 0; i < this.partners.length; i++) { // 通知所有队友玩家游戏失败
			this.partners[i].lose();
		}
		for (let i = 0; i < this.enemies.length; i++) { // 通知所有敌人游戏胜利
			this.enemies[i].win();
		}
	}
};

const playerFactory = function (name, teamColor) {
	const newPlayer = new Player(name, teamColor); // 创建新玩家
	for (let i = 0; i < players.length; i++) { // 通知所有的玩家，有新角色加入
		if (players[i].teamColor === newPlayer.teamColor) { // 如果是同一队的玩家
			players[i].partners.push(newPlayer); // 相互添加到队友列表
			newPlayer.partners.push(players[i]);
		} else {
			players[i].enemies.push(newPlayer); // 相互添加到敌人列表
			newPlayer.enemies.push(players[i]);
		}
	}
	players.push(newPlayer);
	return newPlayer;
};

//红队：
var player1 = playerFactory('皮蛋', 'red'),
	player2 = playerFactory('小乖', 'red'),
	player3 = playerFactory('宝宝', 'red'),
	player4 = playerFactory('小强', 'red');
//蓝队：
var player5 = playerFactory('黑妞', 'blue'),
	player6 = playerFactory('葱头', 'blue'),
	player7 = playerFactory('胖墩', 'blue'),
	player8 = playerFactory('海盗', 'blue');

player1.die();
player2.die();
player4.die();
player3.die();

function Player(name, teamColor) {
	this.name = name; // 角色名字
	this.teamColor = teamColor; // 队伍颜色 
	this.state = 'alive'; // 玩家生存状态
};
Player.prototype.win = function () {
	console.log(this.name + ' won ');
};
Player.prototype.lose = function () {
	console.log(this.name + ' lost');
};

Player.prototype.die = function () {
	this.state = 'dead';
	playerDirector.reciveMessage('playerDead', this); // 给中介者发送消息，玩家死亡
};

Player.prototype.remove = function () {
	playerDirector.reciveMessage('removePlayer', this); // 给中介者发送消息，移除一个玩家
};

Player.prototype.changeTeam = function (color) {
	playerDirector.reciveMessage('changeTeam', this, color); // 给中介者发送消息，玩家换队
};

const playerFactory = function (name, teamColor) {
	const newPlayer = new Player(name, teamColor); // 创造一个新的玩家对象
	playerDirector.reciveMessage('addPlayer', newPlayer); // 给中介者发送消息，新增玩家
	return newPlayer;
};

const playerDirector = (function () {
	const players = {}, // 保存所有玩家
		operations = {}; // 中介者可以执行的操作
	
	operations.addPlayer = function (player) {
		const teamColor = player.teamColor; // 玩家的队伍颜色
		// 如果该颜色的玩家还没有成立队伍，则新成立一个队伍
		players[teamColor] = players[teamColor] || [];
		players[teamColor].push(player); // 添加玩家进队伍
	};
	
	operations.removePlayer = function (player) {
		const teamColor = player.teamColor, // 玩家的队伍颜色
			teamPlayers = players[teamColor] || []; // 该队伍所有成员
		for (let i = teamPlayers.length - 1; i >= 0; i--) { // 遍历删除
			if (teamPlayers[i] === player) {
				teamPlayers.splice(i, 1);
			}
		}
	};
	
	operations.changeTeam = function (player, newTeamColor) { // 玩家换队
		operations.removePlayer(player); // 从原队伍中删除
		player.teamColor = newTeamColor; // 改变队伍颜色
		operations.addPlayer(player); // 增加到新队伍中
	};
	
	operations.playerDead = function (player) {
		const teamColor = player.teamColor,
			teamPlayers = players[teamColor]; // 玩家所在队伍
		let all_dead = true;
		for (let i = 0; i < teamPlayers.length; i++) {
			if (teamPlayers[i].state !== 'dead') {
				all_dead = false;
				break;
			}
		}
		if (all_dead) { // 全部死亡
			for (let i = 0; i < teamPlayers.length; i++) {
				teamPlayers[i].lose(); // 本队所有玩家 lose 
			}
			for (const color in players) {
				if (color !== teamColor) {
					const teamPlayers = players[color]; // 其他队伍的玩家
					for (let i = 0; i < teamPlayers.length; i++) {
						teamPlayers[i].win(); // 其他队伍所有玩家 win 
					}
				}
			}
		}
	};
	const reciveMessage = function () {
		// arguments 的第一个参数为消息名称
		const message = Array.prototype.shift.call(arguments); 
		operations[message].apply(this, arguments);
	};
	return {
		reciveMessage
	}
})();

// 红队：
var player1 = playerFactory('皮蛋', 'red'),
	player2 = playerFactory('小乖', 'red'),
	player3 = playerFactory('宝宝', 'red'),
	player4 = playerFactory('小强', 'red');
// 蓝队：
var player5 = playerFactory('黑妞', 'blue'),
	player6 = playerFactory('葱头', 'blue'),
	player7 = playerFactory('胖墩', 'blue'),
	player8 = playerFactory('海盗', 'blue');
player1.die();
player2.die();
player3.die();
player4.die();

player1.remove(); 
player2.remove(); 
player3.die(); 
player4.die(); 

player1.changeTeam( 'blue' ); 
player2.die(); 
player3.die(); 
player4.die();