WordPress Underscores Theme Jquery Loaded but not Working

Question

Im using the underscores theme for wordpress, jquery is loaded, even tested it with this: and i get the Yeah! back however the tabs : site link doesnt seem to work. the only plugin currently loaded is visual composer however i tested on another theme and the tabs do work on that. would this be a jquery issue or is there something else that would cause the functionality to stop working?

tried running a straight copy theme of underscores and the tabs work so it has to be something i have added to my version built on top of the underscores however, i disabled all the extra scripts i made and set it to only load the originals and still has a problem which has me completely confused. aside from functions and enqueuing is there anything else that could cause this problem?

window.onload = function() {
if (window.jQuery) {  
    // jQuery is loaded  
    alert("Yeah!");
} else {
    // jQuery is not loaded
    alert("Doesn't Work");
}

Answer 1

fixed the issue, annoyingly enough had some syntax issues in the footer. thanks for the help.

Answer 2

I have tried your function part in browser console and it says Yeah!. So jQuery is loaded.

if (window.jQuery) {  
    // jQuery is loaded  
    alert("Yeah!");
} else {
    // jQuery is not loaded
    alert("Doesn't Work");
}

For missing cookie function try loading jQuery Cookie plugin.