javascript gtk example

gistfile1.js

const Gtk = imports.gi.Gtk;

function hello(widget) {
    log("Hello World");
}

function onDestroy(widget) {
    log("destroy signal occurred");
    Gtk.main_quit();
}

Gtk.init(0, null);

let win = new Gtk.Window({ type: Gtk.WindowType.TOPLEVEL });
win.connect("destroy", onDestroy);

let button = new Gtk.Button({ label: "Hello World" });

button.connect("clicked", hello);
button.connect("clicked", function() {
                              win.destroy();
                          });

win.add(button);
button.show();
win.show();
Gtk.main();