当您指定errorClass时，没有什么可以阻止您将其变为两件事:帮助内联错误"，即:

When you specify the errorClass, there's nothing stopping you from making it two things: "help-inline error", i.e.:

$("#register").validate({
    debug: true,
    errorClass: 'error help-inline',
    validClass: 'success',
    errorElement: 'span',
    highlight: function(element, errorClass, validClass) {
      $(element).parents("div.control-group").addClass(errorClass).removeClass(validClass);
    },
    unhighlight: function(element, errorClass, validClass) {
      $(element).parents(".error").removeClass(errorClass).addClass(validClass);
    }
});

请注意，您必须使用jQuery Validate 1.10版本来支持此功能.早期版本仅允许一个errorClass.

Note that you have to use version 1.10 of jQuery Validate to support this. Earlier versions only allow one errorClass.