html:            
            <form  name="formadd" action="">
             First name: <input type="text" name="FirstName" value="Bill" /><br />
             Last name: <input type="text" name="LastName" value="Gates" /><br />
             <input  type="button" value="保存" class="tianjia"/>
            </form>

           jquery:
          <script>
          $(function (){
          $(".tianjia").click(function (){            
             $.post("daili.php?act=postaddactivewl",$('[name=formadd]').serialize(),function (data){
             alert(data);
        },"text");
        });
        });
        </script>    


             php服务端：

        print_r($_POST['FirstName']);