Window: setImmediate() method
This method is used to break up long running operations and run a callback function immediately after the browser has completed other operations such as events and display updates.
Note: This method is not expected to become standard, and is nowadays only implemented by Node.js 0.10+. It meets resistance both from Gecko (Firefox) and Chromium/WebKit (Chrome/Safari).
setImmediate(func) setImmediate(func, param0) setImmediate(func, param0, param1) setImmediate(func, param0, param1, /* … ,*/ paramN)
The function you wish to call.
All parameters will be passed directly to your function.
The ID of the immediate which can be used later with
clearImmediate method can be used to clear
the immediate actions, just like
This method can be used instead of the
setTimeout(fn, 0) method to execute
The feature can be emulated in a few different ways:
postMessagecan be used to trigger an immediate but yielding callback.
MessageChannelcan be used reliably inside of Web Workers whereas the semantics of postMessage mean it cannot be used there.
setTimeout(fn, 0)can potentially be used, however as it is clamped to 4ms for timers nested more than 5 levels deep per the HTML spec, it does not make for a suitable polyfill for the natural immediacy of
All of these techniques are incorporated into a robust setImmediate polyfill.
Not part of any current specifications. The Efficient Script Yielding specification is no longer being worked on.
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