SOURCE

class MusicPlayer {
    
    constructor(){
        this.type = '';
        this.menu = '';
        this.playerList = '';
        this.mainWindows = '';
        this.controlStrip = '';
        this.collectionList = '';
    }

    
    get type(){
        return this.type; 
    }
    set type(type){
        this.type = type;
    }

    // 省略其他 get 和 set 方法
    
    get menu(){
        return this.menu; 
    }
    set menu(menu){
        this.menu = menu;
    }


    get playerList(){
        return this.playerList; 
    }
    set playerList(playerList){
        this.playerList = playerList;
    }


    get mainWindows(){
        return this.mainWindows; 
    }
    set mainWindows(mainWindows){
        this.mainWindows = mainWindows;
    }


    get controlStrip(){
        return this.controlStrip; 
    }
    set controlStrip(controlStrip){
        this.controlStrip = controlStrip;
    }


    get collectionList(){
        return this.collectionList; 
    }
    set collectionList(collectionList){
        this.collectionList = collectionList;
    }
}


class PlayerBuilder {
    constructor() {
        this._player = new MusicPlayer();
    }
    buildType(){
        throw new Error("This method must be overwritten!");
    }
    buildMenu(){
        throw new Error("This method must be overwritten!");
    }
    buildPlayerList(){
        throw new Error("This method must be overwritten!");
    }
    buildMainWindows(){
        throw new Error("This method must be overwritten!");
    }
    buildControlStrip(){
        throw new Error("This method must be overwritten!");
    }
    buildCollectionList(){
        throw new Error("This method must be overwritten!");
    }
    createPlayer(){
        return this._player;
    }
}


class FullPlayerBuilder extends PlayerBuilder{ 
    
    constructor(){
        super();
    }

    buildType() {
        this._player.type = "完整模式";
    }

    buildMenu() {
        this._player.menu = "菜单";
    }

    buildPlayerList() {
        this._player.playerList = "播放列表";
    }

    buildMainWindows() {
        this._player.mainWindows = "主界面";
    }

    buildControlStrip() {
        this._player.controlStrip = "控制条";
    }

    buildCollectionList() {
        this._player.collectionList = "收藏列表";
    }
}


class SimplePlayerBuilder extends PlayerBuilder{
    

    buildType() {
        this._player.type = "精简模式";
    }

    buildMenu() {
        this._player.menu = null;
    }

    buildPlayerList() {
        this._player.playerList = null;
    }

    buildMainWindows() {
        this._player.mainWindows = "主界面";
    }

    buildControlStrip() {
        this._player.controlStrip = "控制条";
    }

    buildCollectionList() {
        this._player.collectionList = null;
    }
}


class MemoryPlayerBuilder extends PlayerBuilder{
    

    buildType() {
        this._player.type = "记忆模式";
    }

    buildMenu() {
        this._player.menu = null;
    }

    buildPlayerList() {
        this._player.playerList = null;
    }

    buildMainWindows() {
        this._player.mainWindows = "主界面";
    }

    buildControlStrip() {
        this._player.controlStrip = "控制条";
    }

    buildCollectionList() {
        this._player.collectionList = "收藏列表";
    }
}



class PlayerController {
    construct(pb) {
        pb.buildType();
        pb.buildMenu();
        pb.buildPlayerList();
        pb.buildMainWindows();
        pb.buildControlStrip();
        pb.buildCollectionList();
        return pb.createPlayer();
    }
}


let builder = new FullPlayerBuilder();

let controller = new PlayerController();
let player = controller.construct(builder);