JavaScript timer implementation

Question

I am trying to find out exactly how JavaScript timers work. In particular whether a timer function is executed immediately the timer expires or instead when the JavaScript engine is in some kind of idle state.

For example if the JavaScript engine is executing a block of code and a timer goes off does the execution of the block of code get interrupted and the timer function called. Or does the JavaScript engine wait until it returns to some kind of idle state before it calls the timer function?

Thanks,

AJ

Great question, I'm wondering the same thing.. For example if some JS code is checking the size of an element in the DOM, but the timer goes off when the browser hasn't completed the rendering yet. — oyvindn
– oyvindn, Commented Feb 5, 2010 at 17:50

meouw · Accepted Answer · 2010-02-05 17:27:18Z

12

Here's a very good explanation from John Resig

how-javascript-timers-work

answered Feb 5, 2010 at 17:27

meouw

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