radio 控制器function用法

        delivery_show();
        $('.delivery_btn').on('click',function(){
            delivery_show();
        });

        function delivery_show() {
            var delivery_type_val = $("input[name='delivery_type']:checked").val();
            if (delivery_type_val == ''){
                $('.delivery_type_1').show();
                $('.delivery_type_2').hide();
            } else if(delivery_type_val == ''){
                $('.delivery_type_2').show();
                $('.delivery_type_1').hide();
            }
        }