<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"> </script>
 <script type="text/javascript">
      $(function(){
          $("li").eq(4).css("display","none");
          $("li").eq(5).css("display","none");
            $("a").click(function(){
                if($("a").text()=="更多"){
                    $("a").text("简化");
          $("li").eq(4).css("display","list-item");
          $("li").

                }
            else{
                $("a").text("更多");
          $("li").

          $("li").

            }
            })
          })
     </script>

试试这样