Call a sku with AJAX or JS?

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I am trying to call a current.sku or selected.sku when there is a selector, but nothing seems change in my link. I was reading another post that said you need to call the sku with AJAX or JS because the original sku is only loaded on initial load and does not change unless the page is refreshed, which is 100% correct. How would you call the sku with AJAX or JS after the selection changed? I have also read about reloading the page after a selection is made, but that doesnt seem to work either.