I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
Kinda. It depends what you're trying to do - for example if you want to replace the handler for a DOM event, you can do that easily enough, but other things aren't possible like simply replacing a function. And you can't touch code that takes place inside someone else's closure...
I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
Yes you can do this, but unless they have the bit of script you want to block in a separate file, then you're likely to be blocking all the other code which is often required to make the site work!
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Is it possible to overwrite a javascript function on a website`?
Kinda. It depends what you're trying to do - for example if you want to replace the handler for a DOM event, you can do that easily enough, but other things aren't possible like simply replacing a function. And you can't touch code that takes place inside someone else's closure...
Can't you block the website's javascript and inject your own? That way you should be able to rewrite whatever you would like, right?
Yes you can do this, but unless they have the bit of script you want to block in a separate file, then you're likely to be blocking all the other code which is often required to make the site work!