how to get checked value in jquery off a checkbox code example

Example 1: jquery checkbox checked value

if ($('#check_id').is(":checked"))
{
  // it is checked
}

Example 2: jquery get value checkbox checked

console.log($('input[name="locationthemes"]:checked').serialize());

//or

$('input[name="locationthemes"]:checked').each(function() {
   console.log(this.value);
});