/** * 窗口管理类，单例，负责创建所有窗口，保存窗口实例 */const path = require('path');const os = require('os');const EucWindow = require('./euc_window');/** * 窗口管理类，单例，负责创建所有窗口，保存窗口实例 */class WindowManager {    constructor() {        this.main = null;        this.about = null;        this.setting = null;    }    /**     * 主窗口     * @returns {EucWindow}     */     createMainWindow(){        if(this.main) return this.main;        // 主窗口样式        const mainStyle = {            // width: 280,            // height: 400,            // resizable: false,   //         frame: os.platform() !== "win32",            show: true        };        this.main = new EucWindow(mainStyle, path.join(__dirname, '../../index.html'), this.main);        return this.main;    }    /**     * 关于窗口     * @returns {EucWindow}     */    createAboutWindow() {        if(this.about) return this.about;        // 关于窗口样式        const style = {            width: 288,            height: 336,            resizable: false,            frame: os.platform() !== "win32",            show: true,            modal: true,            parent: this.main        };        this.about = new EucWindow(style, path.join(__dirname, '../test.html'), this.about);        return this.about;    }}module.exports = WindowManager;