jquery validate 实现动态增加/删除验证规则操作示例

$("#user_regForm").validate({
      errorPlacement: function(error, element){
        if(element.attr("id")=="province"||element.attr("id")=="city"||element.attr("id")=="area"){
          var error_td = element.parent().parent('dd').next();
        }else{
          var error_td = element.parent('dd').next();
        }
        error_td.html("");
        error_td.append(error);
        element.addClass("user_regNok");
      },
      error:function(label,element){
        element.addClass("user_regNok");
      },
      success    : function(label,element){
        label.addClass('reg_validate_right').text('');
        element.removeClass("user_regNok");
      },
      submitHandler:function(form){
        console.info("submit:"+$(form).serializeArray());
        form.submit(); 
      },
      onkeyup: false,
      rules : {
        username:{
          required:true,
          alipay:true,
          remote  : {
            url :'index.php?mod=ajax&act=check_user',
            type:'post',
            data:{
              username : function(){
                return $('#username').val();
              }
            }
          }
        },
        password : {
          required : true,
          rangelength:[6,20]
        },
        password_confirm : {
          required : true,
          equalTo : '#password'
        },
        captcha:{
          required : true,
          maxlength:4,
          remote  : {
            url :'index.php?mod=ajax&act=check_captcha',
            type:'post'
          }
        }
      },
      messages : {
        username:{
          alipay:"输入电子邮箱或手机号码",
          remote:"用户名已存在"
        },
        password : {
          required : '您必须提供一个密码',
          rangelength: '密码长度应在6-20个字符之间'
        },
        password_confirm : {
          required : '您必须再次确认您的密码',
          equalTo : '两次输入的密码不一致'
        },
        captcha:{
          required : "请输入验证码",
          maxlength:"输入4位验证码",
          remote:"验证码错误"
        }
      }
    });

var add_user_validate=function(){
    console.info("add_user_validate");
    remove_user_validate();
    $("#province").rules("add",{required:true,min:0,messages:{min:"请选择省份"}});
    $("#city").rules("add",{required:true,min:0,messages:{min:"请选择城市"}});
    $("#area").rules("add",{required:true,min:0,messages:{ min:"请选择区域"}});
    $("#sjhztype").rules("add",{required:true,min:0,messages:{ min:"请选择合作类型"}});
    $("#realname").rules("add",{required:true});
    $("#tel").rules("add",{required:true,mobile:0});
    $("#shopname").rules("add",{required:true});
  }

var remove_user_validate=function(){
    console.info("remove_user_validate");
    $("#province").rules("remove");
    $("#city").rules("remove");
    $("#area").rules("remove");
    $("#sjhztype").rules("remove");
    $("#realname").rules("remove");
    $("#tel").rules("remove");
    $("#shopname").rules("remove");
  }