In case it is option page
<script>
var testVar = "<?=get_field('field_name','option'); ?>";
</script>
In case it is CPT:
<script>
var testVar = "<?=get_field('field_name',$post_id); ?>";
</script>
So, now you can use testVar in your jQuery after loading page
Trick:
store php & MySql value in hidden inputs with known id and then get this input value by its id in your jQUery code
