Window.setImmediate()

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句法
注意事项
规范
浏览器兼容性
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非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

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.

This method is not expected to become standard, and is only implemented by recent builds of Internet Explorer and Node.js 0.10+. It meets resistance both from Gecko (Firefox) and Webkit (Google/Apple).

句法

var immediateID = setImmediate(func, [param1, param2, ...]);
var immediateID = setImmediate(func);

where immediateID is the ID of the immediate which can be used later with window.clearImmediate .
func is the function you wish to call.

All parameters will be passed directly to your function.

注意事项

clearImmediate method can be used to clear the immediate actions, just like clearTimeout for setTimeout .

This method can be used instead of the setTimeout(fn, 0) method to execute heavy operations .

The feature can be emulated in a few different ways:

postMessage can be used to trigger an immediate but yielding callback. Do note that Internet Explorer 8 includes a synchronous version of postMessage , which means it cannot be used as a fallback.
MessageChannel can 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 setImmediate .

All of these techniques are incorporated into a robust setImmediate polyfill .

规范

规范	状态	注释
Efficient Script Yielding The definition of ' `setImmediate` ' in that specification.	编者草案	初始定义。

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`setImmediate` 非标	Chrome No	Edge 12 — 79	Firefox No	IE 10	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android No

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句法

注意事项

规范

浏览器兼容性

图例

另请参阅

元数据

相关话题