Most if not all bots don't have JavaScript engines.
But not all users use JavaScript.
I can certainly understand that some users don't have JavaScript but
it's the vast minority. The choice is between usability. With captchas
you can exclude the disabled and people with poor eyesight (as well as
those who can't be bothered trying to figure out what it says).
Those that have JavaScript turned off are generally technically
proficient because (in most cases) they've made the choice to turn it
off. So the choice is still there to post as long as you provide good
error messages.
So JavaScript is the least intrusive
Captchas are the most
In between would be a form field that asks a very simple question such
as "what's this site about? Hint: it's Haskell"
Cheers,
Scott
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