禁用ALT + F4，是的，我知道不建议这样做 [英] Disable ALT+F4, yes I know it isn't recommended

问题描述

我需要一个JavaScript脚本，禁止用户使用ALT + F4关闭。我到处都看，但只是每个人都说不建议。

I need a JavaScript script that would disable users from closing using ALT+F4. I have looked everywhere but it just everyone just says it isn't advised.

甚至可能无法实现，如果不是，我只需检测用户何时退出并将其记录在数据库中。

May not even be possible, if it isn't I will just have to detect when the user does quit out this way and log it in a database.

这是我当前的脚本，它会检测用户是按ALT还是F4，但我无法取消该按键。有没有办法让浏览器认为用户按下了另一个键，所以组合将是ALT + G + F4，这会破坏ALT + F4组合？

Here is my current script, it detects if the user presses either ALT or F4, but I can't get it to cancel that key press. Is there a way to make the browser think the user pressed another key as well so the combo would be ALT + G + F4 for example, which would disrupt the ALT+F4 combo?

//Run on keydown, disable user from quiting via ALT+F4
document.onkeydown = function(evt) {
    evt = evt || window.event;
    //Get key unicode
    var unicode = evt.keyCode ? evt.keyCode : evt.charCode;

    //Check it it's ALT or F4 (115)
    if (unicode == 115 || evt.altKey == 1)
    {
        window.event.cancelBubble = true;
        window.event.returnValue = false;
    }
};

推荐答案

那个关键事件是（在我猜的大多数操作系统上）在操作系统甚至被发送到浏览器之前进行处理，因此取消浏览器中的事件将无济于事 - 即使它是在浏览器的UI内执行的Javascript，而不仅仅是当前文档。

That key event is (on most OSs I guess) processed by the OS before it'S even sent to the browser, so cancelling the event inside the browser won't help a thing - even if it was Javascript that is executed inside the browser's UI, not only the current document.

因此 - 你想要做的事情无法完成。

Therefore - what you're trying to do cannot be done.

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