为什么jQuery有时会覆盖window.onbeforeunload？ [英] Why jQuery sometimes overwrites window.onbeforeunload?

问题描述

我遇到了jQuery（1.6.x）的奇怪问题。我在我的页面上有这个简单的调用：

I am having strange problem with jQuery (1.6.x). I have this simple call on my page:

window.onbeforeunload = function() { return 'Are you sure ?'; };

但它不起作用，因为我发现，jQuery会覆盖窗口的内容.onbeforeunload。在JS控制台中，我可以看到window.onbeforeunload包含一段jQuery代码：

But it doesn't work, because as I've found out, jQuery overwrites content of the window.onbeforeunload. In JS console, I can see that window.onbeforeunload contains piece of jQuery code:

function( e ) {
// Discard the second event of a jQuery.event.trigger() and
// when an event is called after a page has unloaded
return typeof jQuery !== "undefined" && (!e || jQuery.event.triggered !== e.type) ?
    jQuery.event.handle.apply( eventHandle.elem, arguments ) : undefined;
};

有没有办法可以找到jQuery覆盖我的onbeforeunload函数的原因和位置？当我尝试使用jQuery加载和我的onbeforeunload函数运行空的jsfiddle时，它按预期工作。

Is there a way I can find why and where jQuery overwrites my onbeforeunload function ? When I try to run empty jsfiddle with just jQuery loaded and with my onbeforeunload function, it works as expected.

任何提示都将不胜感激。提前致谢。

Any hints will be appreciated. Thanks in advance.

编辑：

以防万一，有人建议使用：

Just in case, somebody suggests using:

$(window).bind('beforeunload', function() { return 'Are you sure';} );

我已经尝试了它，它的行为与使用纯javascript的行为相同。

I've already tried it and it behaves the same way as using pure javascript.

推荐答案

好的，我终于找到了一个解决方案，这可能不是最干净的解决方案 - 因为我不知道确切的原因问题 - 但它的确有效。我已将我的beforeunload函数放入jQuery的加载函数中，因此它在DOM和其他元素加载后执行。

Ok, I've finally figured a solution, which is probably not the cleanest one - because I don't know the exact cause of the problem - but it works. I've put my beforeunload function into jQuery's load function so it is executed after DOM and other elements are loaded.

$(window).load(function () {
  $(window).bind('beforeunload', function() { return 'Are you sure ?';} );
});

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