JavaScript + onbeforeunload [英] JavaScript + onbeforeunload

问题描述

我对我的申请有疑问。每当用户意外关闭浏览器窗口时，我都希望在此之前进行一些清理操作。我已经使用过onunload事件，但问题是这个事件有时会被解雇，有时却没有。我该怎么办，是否有更好的方法来处理这类问题。

I have a query regarding my application. Whenever user closes browser window accidentally I'd want to do some clean up operations before that. I have used onunload event but problem is this event is sometimes is firing and sometimes doesn't. What should I do, is there better way to handle such type of problem.

推荐答案

window.onbeforeunload = function() {
    return 'You have unsaved changes!';
}

参见关于onbeforeunload的MSDN文章

此外还有类似问题在SO

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