如何更改html锚定标记查询字符串

var link = '';
$("a").hover(function() {
  link = $(this).attr('href');
  var var1 = $.urlParam('cat', link);
  var var2 = $.urlParam('subcat', link);
  var url = link.split('?')[0] + '/' + var1 + '/' + var2;
  $(this).attr('href', url);

}, function() {
  $(this).attr('href', link);
});
$.urlParam = function(name, link) {
  var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(link);
  if (results == null) {
    return null;
  } else {
    return decodeURI(results[1]) || 0;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a href="category.php?cat=news&subcat=9">Hover Me</a>