gnome-shell (gnome3) 添加一个关机按钮

修改 /usr/share/gnome-shell/js/ui/userMenu.js

// ....
    _createSubMenu: function() {
        // ....

        // wuxb: add 3lines for PowerOff item
        item = new PopupMenu.PopupMenuItem(_("Power Really Off"));
        this.menu.addMenuItem(item);
        item.connect('activate', Lang.bind(this, this._onPowerOffActivate));
    },
    // ....
    // wuxb: add 4 lines for poweroff
    _onPowerOffActivate: function() {
        Main.overview.hide();
        this._session.ShutdownRemote();
    },  // <-注意这些可恶的逗号
});