main.js

const electron = require('electron');
const {app, BrowserWindow} = electron;
global.coordinator = new(require('events').EventEmitter);
global.windows = {};

coordinator.on('exit', () => {
    app.exit(0);
});
app.on('window-all-closed', () => {
    app.exit(0);
});

app.on('ready', () => {

    windows.panelWindow = new BrowserWindow({
        width: 390,
        height: 150, 
        resizable: false, 
        icon: `${__dirname}/danmu.png`, 
    });
    windows.panelWindow.loadURL(`file://${__dirname}/panel.html`);
    windows.panelWindow.on('closed', () => {
        //app.exit();
    });
    windows.panelWindow.setMenu(null);

    windows.mainWindow = new BrowserWindow({
        transparent: true,
        frame: false,
        toolbar: false,
        resizable: true,
        title: "DANMU Client", 
        alwaysOnTop: true,
        icon: __dirname + '/danmu.png', 
    });
    windows.mainWindow.loadURL(`file://${__dirname}/index.html`);
    windows.mainWindow.on('closed', () => {
        coordinator.emit("exit");
    });
    windows.mainWindow.setMenu(null);

});