CSS селекторы JavaScript

 var element = document.querySelectorAll('.group .select:not(.select-group)'); 
 
element.forEach(function(element) { 
  console.log(element); 
});

body{font-family:tahoma;font-size:12px} 
.group {max-width:600px;background:#eee;padding:15px}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> 
 
<div class="group"> 
<input type="checkbox" class="select" />check 
<input type="checkbox" class="select" />check 
<input type="checkbox" class="select" />check 
 
<input type="checkbox" class="select select-group" />select-group 
<input type="checkbox" class="select select-group" />select-group 
<input type="checkbox" class="select select-group" />select-group 
</div>