<script type="text/javascript">
          $(document).ready(function () {
              $("#mylist li span").each(function () {
                  var myid = $(this).attr(‘classid‘);
                  var mytext = $.ajax({
                      type: "POST",
                      url: "GetCountClass.ashx",
                      data: { "classid": myid },
                      async: false
                  }).responseText;
                  $(this).html(" ("+mytext+")");
              });
          });
    </script>
原文:http://www.cnblogs.com/future/p/7679924.html