Why are online minifiers changing my code?

I have on my original code ...

if (typeof Object.create !== "function") {
    Object.create = function (obj) {
    function F() {}
    F.prototype = obj;
    return new F();
};
}
(function ($, window, document) {

var Carousel = {
    init : function (options, el) {
        var ba ........

and the minifier returns...

"function"!=typeof Object.create&&(Object.create=function(t){function e(){}return e.prototype=t,new e}),function(t,e,o){var i={init:function(e,o){var i=this;i.$elem=t(o),i.options=t.extend({},t.fn.owlCarousel.options,i.$elem.data(),e),i.userOptions=e,i.loadContent()},loadContent:function(){var e,o=this;"function"==t....

Can I get a recommendation for an online minifier that respects my code and only eliminates comments and unnecessary spaces for my CSS and JAVASCRIPTS?

Solution

It doesn't really change your code! It uglifies your code, mangles names and properties and function names. That's really a minifier does. If you don't want any of this options you can use https://www.uglifyjs.net/ that allows you to choose your options.