I need show a modal if these strings contains the page into a div

For example, i have 3 strings to verify if contains in a page, if this strings are not in this page the modal doesn't load on page, and if string contains on page load this opens this modal.

$(document).ready(function() {
    $('.fl-product-ref').load(function(){
      var lightBox = $('.skuReference');
      switch(false) {
        case (lightBox.find('LNC-L4139800')):
        case (lightBox.find('LNC-L6669601')):
        case (lightBox.find('LNC-L6669600')):
            lightBox.removeClass('hidden').addClass('visible');
            break;
        default:
            lightBox.addClass('hidden');
            break; 
      }
    });
}

<span class="fl-product-ref">
  <div class="skuReference">LNC-L4139800</div>
</span>

<div class="skuModal hidden">
  This is the modal!
</div>

Solution

<!DOCTYPE html>
<html>
<head>
    <title></title>

    <style type="text/css">
        .hidden{
      visibility :hidden;
    }
    </style>
</head>
<body>

<span class="fl-product-ref">
  <div class="skuReference">LNC-L4139800</div>
  <div class="skuReference">LNC-L4139800</div>
  <div class="skuReference">LNC-L6669601</div>
  <div class="skuReference">LNC-L4139800</div>
</span>

<div class="skuModal hidden">
  This is the modal!
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
   // $('.fl-product-ref').load(function(){
      var arr = $('.skuReference').map(function(index , val){ return $(val).text()});
      //["LNC-L4139800", "LNC-L4139800", "LNC-L6669601", "LNC-L4139800"]

      switch(true) {
        case ($.inArray("LNC-L4139800", arr) !== -1):
        case ($.inArray("LNC-L6669601", arr) !== -1):
        case ($.inArray("LNC-L6669600", arr) !== -1):
            $('.skuModal').removeClass('hidden').addClass('visible');
            break;
        default:
            $('.skuModal').addClass('hidden');
            break; 
      }
    //});
});
</script>
</body>
</html>