jquery.validate.js验证记忆无法清除

function validateLogin(act){    if(act == 'login'){        var messages =         {            code:{                required:"验证码不能为空", minlength:'验证码长度不符', maxlength:'验证码长度不符', number:'验证码只能是数字'            },            mobile:{                required:"手机号不能为空", mobile:"请输入正确的手机号"            }        },        rules = {            code:{                required:true, minlength:1, maxlength:8, number:true            },            mobile:{                required:true, mobile:true            }        };    }else{        var messages =         {            mobile:{                required:"手机号不能为空", mobile:"请输入正确的手机号"            }        },        rules = {            mobile:{                required:true, mobile:true            }        };    }    addValidator('mobile');    var validator = $("#login_form").validate({        errorPlacement:function(error, element) {            $.tips(error[0].innerText);        },        onkeyup:false,        rules:rules,        messages:messages,    });    if(!$("#login_form").valid()){        return false;    }    return true;}

我先validateLogin('login')再validateLogin('code')结果一直提示验证码不能为空，意思就是validateLogin('login')的时候记忆没有清除，什么resetForm,removeClass,removeAttr,removeData都试过了，没用！求解决办法