Add extension standard idea to jquery

jQuery extension is divided into object extension and jQuery itself class extension:

Object extension:

(function($){
    $.fn.abc = function(){
        console.log($(this).get(0));
    }
})(jQuery);

Instructions:

$(function(){
    $(".otherdiv").abc();
});

jQuery itself class extension:

(function($){
    $.extend({
        showMsg:function(){
            alert('some msg');
        }
    });
})(jQuery);

Instructions:

$(function(){
    $.showMsg();
});