关于捕获用户何时点击window.onbeforeunload的取消事件

时间：2021-05-25

Detecting When The User Has Clicked Cancel
One of the things you may want to do is to be notified when the user clicks cancel, aborting a page unload. Unfortunately there's no way to be immediately notified. The best you can do is to set a unique global variable in your "onbeforeunload" event and then look to see if that variable has been set in other functions. There is no way to get an immediate notification that the user has aborted a page unload.
The example code I used above to do an example of an "onbeforeunload" dialog is as follows:
复制代码 代码如下:
var _isset=0;

function demo() {
window.onbeforeunload = function () {
if (_isset==0) {
_isset=1; // This will only be seen elsewhere if the user cancels.
return "This is a demonstration, you won't leave the page whichever option you select.";
}
}
_isset=0;
window.location.reload();
return false;
}

This code defines a global variabled named _isset, and then initializes it to zero. In our "onbeforeunload" event the variable is checked and if it's set to one, no unload dialog box will appear. The only way _isset could ever be one is if the user previously aborted a page unload.

But as you can see this method won't help you if you need to be immediately notified that that the user has finished dealing with the confirmation box. You can detect when it appears on the screen but there's no way to know when the user has finished interacting with it if the user clicked cancel (if the user clicked OK, then of course the unload event will have been tripped).
--------------------------------------------------------------
虽然如此，但还是有高手给出了如下代码 ^^
复制代码 代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://";
}
}

//]]>
</script

声明：本页内容来源网络，仅供用户参考；我单位不保证亦不表示资料全面及准确无误，也不保证亦不表示这些资料为最新信息，如因任何原因，本网内容或者用户因倚赖本网内容造成任何损失或损害，我单位将不会负任何法律责任。如涉及版权问题，请提交至online#300.cn邮箱联系删除。

相关文章