javascript - What is the difference between setTimeout(fn, 0) and setTimeout(fn, 1)?

Question

The jQuery source features uses of setTimeout with both 0 and 1 as second argument. I'm under the impression that they both mean "execute the function as soon as you can".

Is this correct? Is there a difference between the two?

Answer 1

setTimeout has a minimum timeout of 4ms. So there is actually no difference between the two.

If the currently running task is a task that was created by the setTimeout() method, and timeout is less than 4, then increase timeout to 4.

Spec

EDIT: As pointed out by Ahmad in the comments, the spec has changed now, so the answer would currently be, "It depends."