onbeforeunload支持检测 [英] onbeforeunload support detection

问题描述

我想检查当前浏览器是否支持onbeforeunload事件。
常见的javascript方式似乎不起作用：

I'd like to check if the current browser supports the onbeforeunload event. The common javascript way to do this does not seem to work:

if (window.onbeforeunload) {
    alert('yes');
}
else {
    alert('no');
}

实际上，它只会检查某个处理程序是否已附加到事件中。
有没有办法检测是否支持onbeforeunload而不检测特定的浏览器名称？

Actually, it only checks whether some handler has been attached to the event. Is there a way to detect if onbeforeunload is supported without detecting the particular browser name?

推荐答案

我写了一篇关于a在现代浏览器中，或多或少的可靠的推理检测事件支持前一段时间。您可以在演示页面上看到至少在Safari 4 +，FF3.x +和IE中支持beforeunload。

I wrote about a more-or-less reliable inference for detecting event support in modern browsers some time ago. You can see on a demo page that "beforeunload" is supported in at least Safari 4+, FF3.x+ and IE.

编辑：此技术现在用于jQuery，Prototype.js，Modernizr以及其他脚本和库。

Edit: This technique is now used in jQuery, Prototype.js, Modernizr, and likely other scripts and libraries.

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