WindowEventHandlers.onunload

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onunload 特性为 WindowEventHandlers 混合 EventHandler 为处理 unload events. These events fire when the window is unloading its content and resources. The resource removal is processed after the unload event occurs.

注意： Browsers equipped with pop-up blockers will ignore all Window.open() method calls in onunload event handler functions.

句法

window.addEventListener("unload", function(event) { ... });
window.onunload = function(event) { ... };

Typically, it is better to use window.addEventListener() 和 unload event, instead of onunload .

规范

规范	状态	注释
HTML 实时标准 The definition of 'onunload' in that specification.	实时标准
HTML 5.1 在该规范中的 GlobalEventHandlers 定义。	推荐
HTML5 在该规范中的 GlobalEventHandlers 定义。	推荐

浏览器兼容性

The compatibility table on 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
`onunload`	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

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完整支持

In Firefox 1.5, using this event handler in your page prevents the browser from caching the page in the in-memory bfcache. See Using Firefox 1.5 caching 了解细节。

元数据

最后修改： 2019 年 3 月 23 日

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