Open LInk in new window via JS

new-window.js

    //4. SET EXTERNAL LINKS
    function setRelAttribute() {
      var elems = document.body.querySelectorAll('.mainbody a:not([class^="glightbox"])');
    
      var l = window.location.hostname;
      var regex = new RegExp('^https?:\/\/' + l.replace(/\./g, '\\.') + '(\/.*)*$|^\/.*$');
    
      for (var i = 0; i < elems.length; i++) {
        var elem = elems[i];
        var isInternal = regex.test(elem.href);
        if (!isInternal) {
          if (elem.rel === '') {
            elem.rel = 'noopener';
          }
    
          elem.setAttribute('target', '_blank');
          elem.classList.add('no-barba');
    
        }
      }
    }
    
    setRelAttribute();