Pengenalan komprehensif kepada JavaScript berorientasikan objek

/*模拟数据储存器抽象类，其实这个类不要也可以*/
class DataStorageManagerBase {
    static getIns() {
        /* 储存器在整个应用的生命周期里应该只有一个实例 */
        if (!this._ins) this._ins = new this();
        return this._ins;
    }
    constructor() {
        this.name = null;
    }
    save(name/* string */, data/* any */) {
        throw '"' + this.constructor.name + "'类没有save()方法";
    }
    load(name/* string */) {
        throw '"' + this.constructor.name + "'类没有load()方法";
    }
}
class LocalStorageManager extends DataStorageManagerBase {
    static getIns() {
        /* 静态方法不能继承 */
        if (!this._ins) this._ins = new this();
        return this._ins;
    }
    constructor() {
        super();
        this.name = 'localStorage';
    }
    save(name/* string */, data/* any */) {
        console.log(name,data)
        if (!window.localStorage) return this;//判断这个储存器可用不可用，你也可以在这里抛出错误
        window.localStorage[name] = JSON.stringify(data);
        return this;
    }
    load(name/* string */) {
        //如果储存器不可用，返回false
        if (!window.localStorage) return false;
        //如果没有这个数据，返回false
        if (!window.localStorage[name]) return false;
        let dataLoaded = JSON.parse(window.localStorage[name]);
        return dataLoaded;
    }
}

class GlobalData {
    static addStorage(storage/* DataStorageManagerBase */) {
        /*动态添加储存器*/
        this._storages.push();
    }
    static getStorages() {
        return this._storages;
    }
    constructor(name, data, version) {
        this.name = name;
        this.data = data;
        this.version = version || 1;
        this._loadData();
        //初始化的该对象的时候，读取localStorage里的数据，看有没有已储存的数据，有就用该数据
    }
    getData() {
        return this._copy(this.data);
    }
    setData(data, notSave) {
        this.data = this._copy(data);
        if (!!notSave) return this;
        let dataToSave = {
            name: this.name,
            version: this.version,
            data: this.data
        };
        let storages = GlobalData.getStorages();
        for (let i = 0, l = storages.length; i 
<div style="font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;"><strong>Objek capaian data</strong></div>
<p>Untuk pengurusan objek data, tiga antara muka getData(), setData(), dan config() didedahkan kepada dunia luar Pengguna menggunakan modul ini melalui tiga antara muka ini</p>
<pre class="brush:php;toolbar:false">class GlobalDataDao {
    static getIns() {
        if (!this._ins) this._ins = new this();
        return this._ins;
    }
    constructor() {
        this.GlobalDataClass = GlobalData;
        this._dataList = [];
    }
    getData(name/* string */) {
        let dataIns = this.getDataIns(name);
        if (!!dataIns) {
            return dataIns.getData();
        } else {
            return null;
        }
    }
    setData(name/* string */, data/* any */, notSave = false/* ?boolean */) {
        let dataIns = this.getDataIns(name);
        dataIns.setData(data, notSave);
        return this;
    }
    config(configs/* Array */) {
        /* 初始化数据
        interface Config {
            name: string;
            data； any;
            version?: number;
        }
        */
        for (let i in configs) {
            let de = configs[i];
            if (!!this.getDataIns(de.name)) {
                /* 如果数据名重复，抛出错误 */
                throw new Error('data name "' + de.name + '" is exist');
            };
            let dataIns = new GlobalData(de.name, de.data, de.version);
            this._dataList.push(dataIns);
        }
        return this;
    }
    getDataIns(name/* string */) {
        for (let i in this._dataList) {
            if (this._dataList[i].name === name) {
                return this._dataList[i];
            }
        }
        return false;
    }
}

/*用法*/
let globalDataManeger = GlobalDataDao.getIns();

let configs = [
    {
        name: 'languageUsing',
        version: 1,
        data: {
            name: '简体中文',
            value: 'zh-cn'
        }
    }, {
        name: 'userPreference',
        version: 1,
        data: {
            theme: 'blue',
            menu: 'side_bar'
        }
    }
];
globalDataManeger.config(configs);
console.log(globalDataManeger);
let languageUsing = globalDataManeger.getData('languageUsing');
console.log(languageUsing);
languageUsing.name = 'English';
languageUsing.value = 'en';
globalDataManeger.setData('languageUsing', languageUsing);