If child doesn't have class add class

I'm trying to add a class to a child via jquery only if all the children of the parent do not contain the class already. I can't figure out what I'm doing wrong:

http://ift.tt/21iyYle

<style type="text/css">
.active-tag {
    color: red;
}
</style>

<div class="tagcloud">
  <a class="all" href="#all">All</a>
  <a class="test1" href="#1">1</a>
  <a class="test2" href="#1">1</a>
  <a class="test3" href="#1">1</a>
</div>

<script>
  if (!$('.tagcloud a').hasClass('active-tag')) {
    $('.all').addClass('active-tag');
  }
</script>