ExtJs mvvm 模式，Application launch 不执行

 Ext.define('Chs.Application', {
    extend: 'Ext.app.Application',

    name: 'Chs',

    stores: [
        // TODO: add global / shared stores here
    ],

    views: [
        'Chs.view.login.Login'
    ],
    launch: function () {

        alert();



        Ext.create({
            xtype: 'login'
        });

    },

    onAppUpdate: function () {
        Ext.Msg.confirm('Application Update', 'This application has an update, reload?',
            function (choice) {
                if (choice === 'yes') {
                    window.location.reload();
                }
            }
        );
    }
});

http://blog.csdn.net/sushengmiyan/article/details/38815923