使用jQuery验证重新启用表单选择验证后启用它

$(document).ready(function() {

    $('#myform').validate({
        rules: {
            foo: {
                required: true
            },
            bar: {
                required: true
            }
        }
    });
    
    $('#enable').click(function(){
    	$('#bar').attr('disabled', false);
    });

});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.min.js"></script>

<form id="myform">
    <input type="text" name="foo" />
    <br>
    <input type="text" name="bar" id="bar" disabled />
    <br>
    <a href="javascript:void(0);" id="enable">Enable It</a>
    <br>
    <input type="submit" />
</form>