如果输入为空，则应该禁用一个按钮，但另一个按钮也会受到影响。

I'm trying to write a login/register page and make the "login" button disabled if the fields are not filled in (login and password). However it's also affection the "register" button, which is asking for the fields to be filled in as well.I'm trying to write a login/register page and m