Table of Contents
Stability: 5 - Locked
All of the timer functions are globals. You do not need to
this module in order to use them.
setTimeout(callback, delay[, arg][, ...])#
To schedule execution of a one-time
delay milliseconds. Returns a
timeoutObject for possible use with
clearTimeout(). Optionally you can
also pass arguments to the callback.
It is important to note that your callback will probably not be called in exactly
delay milliseconds - Node.js makes no guarantees about the exact timing of when
the callback will fire, nor of the ordering things will fire in. The callback will
be called as close as possible to the time specified.
Prevents a timeout from triggering.
setInterval(callback, delay[, arg][, ...])#
To schedule the repeated execution of
intervalObject for possible use with
you can also pass arguments to the callback.
Stops an interval from triggering.
The opaque value returned by
setInterval also has the method
timer.unref() which will allow you to create a timer that is active but if
it is the only item left in the event loop won't keep the program running.
If the timer is already
unref again will have no effect.
In the case of
setTimeout when you
unref you create a separate timer that
will wakeup the event loop, creating too many of these may adversely effect
event loop performance -- use wisely.
If you had previously
unref()d a timer you can call
ref() to explicitly
request the timer hold the program open. If the timer is already
ref again will have no effect.
setImmediate(callback[, arg][, ...])#
To schedule the "immediate" execution of
callback after I/O events
callbacks and before
setInterval . Returns an
immediateObject for possible use with
clearImmediate(). Optionally you
can also pass arguments to the callback.
Callbacks for immediates are queued in the order in which they were created. The entire callback queue is processed every event loop iteration. If you queue an immediate from inside an executing callback, that immediate won't fire until the next event loop iteration.
Stops an immediate from triggering.