Extending a js class via Jquery.extend?

Question

JavaScript

what are the pitfalls of this approach?

var Handler = {
    options: {},
    doSome: function() {
    },
    init: function() {
    }
}

var handler = $.extend(true,{},Handler);
handler.doSome = function() { переопределенная логика }
handler.init();

are there any nuances with closures when using this? how to address the members of the "class" inside it?