I have bridge_id. How can I concatenate the single quotation in JavaScript?

Javascript code:

$('input[type=checkbox][name=print_check]:checked').each(function(i){
  print_ids = print_ids+','+$(this).val();
});

Now it's appearing like this:

('B51622,D63766,J7473838,K884474,Y838383')

But I want it like this:

('B51622','D63766','J7473838','K884474','Y838383')

How can I generate a single quotation mark in JavaScript?