"formula2", //验证方法名称

                                     function(value, element, param) {//验证规则

                                               var reg = /^\d{4}$/;

                                               return reg.test(value);

                                     },

                                     '请正确输入你的电话号码'

                            );

                   step2 使用 跟其它规则的使用方式一样。

         其它：

                   span.error {

                              background:url("../images/unchecked.gif") no-repeat 0px 0px;

                              padding-left: 16px;

                            }

                   span.success {

                         background:url("../images/checked.gif") no-repeat 0px 0px;

                         padding-left: 16px;

                   }