From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Thu, 8 Nov 2018 00:38:48 +0800
Subject: switch to vuepress

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+# immediate [![Build Status](https://travis-ci.org/calvinmetcalf/immediate.svg?branch=master)](https://travis-ci.org/calvinmetcalf/immediate)
+
+[![testling status](https://ci.testling.com/calvinmetcalf/immediate.png)](https://ci.testling.com/calvinmetcalf/immediate)
+
+```
+npm install immediate --save
+```
+
+then
+
+```js
+var immediate = require("immediate");
+
+immediate(function () {
+  // this will run soon
+});
+
+immediate(function (arg1, arg2) {
+  // get your args like in iojs
+}, thing1, thing2);
+```
+
+## Introduction
+
+**immediate** is a microtask library, decended from [NobleJS's setImmediate](https://github.com/NobleJS/setImmediate), but including ideas from [Cujo's When](https://github.com/cujojs/when) and [RSVP][RSVP].
+
+immediate takes the tricks from setImmedate and RSVP and combines them with the schedualer inspired (vaugly) by whens.
+
+Note versions 2.6.5 and earlier were strictly speaking a 'macrotask' library not a microtask one, [see this for the difference](https://github.com/YuzuJS/setImmediate#macrotasks-and-microtasks), if you need a macrotask library, [I got you covered](https://github.com/calvinmetcalf/macrotask).
+
+Several new features were added in versions 3.1.0 and 3.2.0 to maintain parity with
+process.nextTick, but the 3.0.x series is still being kept up to date if you just need
+the small barebones version
+
+## The Tricks
+
+### `process.nextTick`
+
+Note that we check for *actual* Node.js environments, not emulated ones like those produced by browserify or similar.
+
+### `MutationObserver`
+
+This is what [RSVP][RSVP] uses, it's very fast, details on [MDN](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver).
+
+
+### `MessageChannel`
+
+Unfortunately, `postMessage` has completely different semantics inside web workers, and so cannot be used there. So we
+turn to [`MessageChannel`][MessageChannel], which has worse browser support, but does work inside a web worker.
+
+### `<script> onreadystatechange`
+
+For our last trick, we pull something out to make things fast in Internet Explorer versions 6 through 8: namely,
+creating a `<script>` element and firing our calls in its `onreadystatechange` event. This does execute in a future
+turn of the event loop, and is also faster than `setTimeout(…, 0)`, so hey, why not?
+
+## Tricks we don't use
+
+### `setImmediate`
+We avoid this process.nextTick in node is better suited to our needs and in Internet Explorer 10 there is a broken version of setImmediate we avoid using this.
+
+
+## Reference and Reading
+
+ * [Efficient Script Yielding W3C Editor's Draft][spec]
+ * [W3C mailing list post introducing the specification][list-post]
+ * [IE Test Drive demo][ie-demo]
+ * [Introductory blog post by Nicholas C. Zakas][ncz]
+ * I wrote a couple blog pots on this, [part 1][my-blog-1] and [part 2][my-blog-2]
+
+[RSVP]: https://github.com/tildeio/rsvp.js
+[spec]: https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/setImmediate/Overview.html
+[list-post]: http://lists.w3.org/Archives/Public/public-web-perf/2011Jun/0100.html
+[ie-demo]: http://ie.microsoft.com/testdrive/Performance/setImmediateSorting/Default.html
+[ncz]: http://www.nczonline.net/blog/2011/09/19/script-yielding-with-setimmediate/
+[nextTick]: http://nodejs.org/docs/v0.8.16/api/process.html#process_process_nexttick_callback
+[postMessage]: http://www.whatwg.org/specs/web-apps/current-work/multipage/web-messaging.html#posting-messages
+[MessageChannel]: http://www.whatwg.org/specs/web-apps/current-work/multipage/web-messaging.html#channel-messaging
+[cross-browser-demo]: http://calvinmetcalf.github.io/setImmediate-shim-demo
+[my-blog-1]:http://calvinmetcalf.com/post/61672207151/setimmediate-etc
+[my-blog-2]:http://calvinmetcalf.com/post/61761231881/javascript-schedulers
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