系统崩溃后mysql事务会回滚吗？(Will mysql transactions rollback after system crash?)

 我想你自己给出了答案。 focus和blur是要用于此的事件，它们并非专门用于输入元素，您可以在此处看到[1]。 我甚至在图层用例中手动触发focus事件：图层打开，我想捕获ESC的按键以关闭图层。 为此，我需要将焦点设置在图层上，否则我的事件处理程序不会触发。 
 
 要捕获外部的单击，您只需要在跨越整个屏幕的元素上注册pointerUp或click事件（它必须真正覆盖整个屏幕，如body元素）。 由于事件冒泡，只要没有其他任何捕获并取消它，处理程序就会触发。 
 
 [1] https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#event-type-blur 

I think you gave the answer yourself. focus and blur are the events to be used for this and they are not exclusively meant for input elements, as you can see here [1]. I'm even trigger the focus event manually in a layer use case: A layer opens and I want to capture the keypress of ESC to close the layer. For this I need to set the focus on the layer as my event handler would not fire otherwise.
 
To capture the click outside you just need to register for pointerUp or click events on an element that spans the whole screen (it must really cover the whole screen like the body element). Because of the event bubbling the handler will fire as long as nothing else captured and cancelled it.
 
[1] https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#event-type-blur