以“未知”形式查找所有单选按钮

I am trying to write javascript code that will find all radio groups in a form and check to make sure one is clicked in each group. This is not hard if you know the form and group names. What I would like to do is create some code that could be called using 'onsubmit' from any form. I want to keep the code generic enough to use without customization for each form.I am trying to write javascript code that will