onbeforeunload根本不起作用
[英]onbeforeunload not working at all
问题描述
I have this code: 
我有以下代码：
(function() {
window.onbeforeunload = function () {
alert("hi")
console.log("unloading");
};
})();
I also have this code: 我也有这段代码：
window.addEventListener("beforeunload", function() {
alert("hi")
console.log("unloading")
});
None of them seem to work. 他们似乎都不起作用。 All I want to do is log when the user tries to leave the page, but this isn't happening (latest Chrome, latest Firefox, Edge....), can anybody shed some light on why it's not working? 我只想在用户尝试离开该页面时进行日志记录，但是这种情况没有发生（最新的Chrome，最新的Firefox，Edge ....），有人可以阐明为什么它不起作用吗？
4 个解决方案
解决方案1
1 2016-06-03 11:46:59
Since 25 May 2011, the HTML5 specification states that calls to window.alert(), window.confirm(), and window.prompt() methods may be ignored during this event.
Also, use return statement to prompt user before leaving 另外，使用return语句在离开前提示用户
window.addEventListener("beforeunload", function() {
return "hi";
});
解决方案2
0 2016-06-03 11:45:21
Do it this way: 这样做：
window.onbeforeunload = function (e) {
console.log("unloading");
return "Hi";
};
That will alert Hi when page unloads and also prints unloading in console 这将在页面卸载时向Hi发出警报，并在控制台中显示打印unloading
解决方案3
0 2016-06-03 11:56:26
function myFunction() { return "Write something clever here..."; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <body onbeforeunload="return myFunction()"> </body>
解决方案4
0 2016-06-03 11:59:09
You have to return from the onbeforeunload: 您必须从onbeforeunload返回：
(function() {
window.onbeforeunload = function () {
alert("hi")
console.log("unloading");
return null;
};
})();
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