yii2清空模态框表单的数据，每次点击开始之前让数据清空

方法一：
$this->registerJs(<<<JS
            $('.refund-audit-btn').click(function(){
                var id = $(this).attr('data-id');
                //清空错误提示文字
                $('.warning-active').html('');
                //清空输入框的值
                $('#refund-order-form ,form-group').find('.form-control').val('');
                var form = $('#refund-order-form');
                $.get('{$ajaxGetRefundInfoUrl}', {order_id: id}, function(rs){
                    form.find('[name=refund_amount]').val(rs['data']['is_refund_apply'] ? rs['data']['require_refund_amount'] : rs['data']['can_refund_amount']);
                    form.find('[name=refund_reason]').val(rs['data']['refund_reason']);
                    $('#refund_is_cancel').prop('checked', rs['data']['is_cancel']);
                    form.find('[name=refund_explain]').val(rs['data']['refund_explain']);
                }, 'json');
                form.find('#refund_order_id').val(id);
                //点击输入框的提交按钮，防止数据丢失，和id丢失
                $('.refund-btn').click(function() {
                    form.find('#refund_order_id').val(id);
                })
            });
            $('#refund-order-form').on('beforeSubmit', function(){
                var form = $(this);
                $.post(form.attr('action'), form.serialize(), function(rs){
                    if(rs.status === 200)
                    {
                        form.trigger('reset.yiiActiveForm');
                        window.location.reload();
                    }
                    else
                    {
                        form.find('.warning-active').html('<i></i>'+rs.message);
                    }
                }, 'json');
                return false;
            });
JS
            )?>

$('#refund-order-form').trigger('reset.yiiActiveForm');//使用id