10 中介者模式

定义：对象与对象之间借助第三方中介者通信

    class Player {
        constructor(name) {
            this.name = name;
    
            this.playerMiddle = new PlayerMiddle();
            this.playerMiddle.add(name);
        }
    
        win() {
            this.playerMiddle.win(this.name);
        }
    
        lose() {
            this.playerMiddle.lose(this.name);
        }
    }
    
    // 中介者
    class PlayerMiddle {
        constructor() {
            this.players = [];
            this.winArr = [];
            this.loseArr = [];
        }
    
        add(name) {
            this.players.push(name)
        }
    
        win(name) {
            this.winArr.push(name)
            if (this.winArr.length + this.loseArr.length === this.players.length) {
                this.show()
            }
        }
    
        lose(name) {
            this.loseArr.push(name)
            if (this.winArr.length + this.loseArr.length === this.players.length) {
                this.show()
            }
        }
    
        show() {
            for (let winner of this.winArr) {
                console.log(winner + '挑战成功;')
            }
    
            for (let loser of this.loseArr) {
                console.log(loser + '挑战失败;')
            }
        }
    }
    
    const a = new Player('A 选手')
    const b = new Player('B 选手')
    const c = new Player('C 选手')
    
    a.win()
    b.win()
    c.lose()