Today, when adjusting the interface to the background, there is a checkbox check box on the page. If selected, the form form submission will send the value value to the background as y; if it is not selected, how to send the value to n? -because if checked is not selected, form will not send this field when it is submitted.
I judged the status of the check box before submit. If it is not selected, the value is assigned to n; but it does not take effect, how do the gods deal with it?