是否有任何跨浏览器的JavaScript/jQuery代码来检测浏览器或浏览器标签是否正在关闭，但不是由于链接被单击?
当前回答
它可以用来提醒用户是否有数据未保存或类似的事情。当标签页关闭或浏览器关闭或网页刷新时，此方法有效。
除非用户没有与网页进行交互，否则它不会工作，这是一种对抗恶意网站.....的机制除非你至少在网站窗口上点击或触摸，否则不会弹出窗口。
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form>
<textarea placeholder = "Write...."></textarea>
</form>
<script type="text/javascript">
window.addEventListener('beforeunload', function (e) {
e.returnValue = '';
});
</script>
</body>
</html>
其他回答
简单的解决方案
window.onbeforeunload = function () {
return "Do you really want to close?";
};
如果我没说错，你想知道什么时候一个标签/窗口是有效关闭的。好吧，在JavaScript中检测这个的唯一方法是使用onunload或onbeforeunload事件。
不幸的是(或幸运的是?)，当您通过链接或浏览器的后退按钮离开网站时，这些事件也会被触发。这是我能给出的最好答案，我不认为你能在JavaScript中原生检测纯close。如果我说错了，请指正。
正如@jAndy提到的，没有合适的javascript代码来检测一个窗口正在关闭。 我从@Syno的提议开始。
我曾经遇到过类似的情况，只要你遵循这些步骤，你就能发现它。 我在Chrome 67+和Firefox 61+上进行了测试。
var wrapper = function () { //ignore this
var closing_window = false;
$(window).on('focus', function () {
closing_window = false;
//if the user interacts with the window, then the window is not being
//closed
});
$(window).on('blur', function () {
closing_window = true;
if (!document.hidden) { //when the window is being minimized
closing_window = false;
}
$(window).on('resize', function (e) { //when the window is being maximized
closing_window = false;
});
$(window).off('resize'); //avoid multiple listening
});
$('html').on('mouseleave', function () {
closing_window = true;
//if the user is leaving html, we have more reasons to believe that he's
//leaving or thinking about closing the window
});
$('html').on('mouseenter', function () {
closing_window = false;
//if the user's mouse its on the page, it means you don't need to logout
//them, didn't it?
});
$(document).on('keydown', function (e) {
if (e.keyCode == 91 || e.keyCode == 18) {
closing_window = false; //shortcuts for ALT+TAB and Window key
}
if (e.keyCode == 116 || (e.ctrlKey && e.keyCode == 82)) {
closing_window = false; //shortcuts for F5 and CTRL+F5 and CTRL+R
}
});
// Prevent logout when clicking in a hiperlink
$(document).on("click", "a", function () {
closing_window = false;
});
// Prevent logout when clicking in a button (if these buttons rediret to some page)
$(document).on("click", "button", function () {
closing_window = false;
});
// Prevent logout when submiting
$(document).on("submit", "form", function () {
closing_window = false;
});
// Prevent logout when submiting
$(document).on("click", "input[type=submit]", function () {
closing_window = false;
});
var toDoWhenClosing = function() {
//write a code here likes a user logout, example:
//$.ajax({
// url: '/MyController/MyLogOutAction',
// async: false,
// data: {
// },
// error: function () {
// },
// success: function (data) {
// },
//});
};
window.onbeforeunload = function () {
if (closing_window) {
toDoWhenClosing();
}
};
};
对于类似的任务，可以使用sessionStorage在本地存储数据，直到关闭浏览器选项卡。
sessionStorage对象仅存储一个会话的数据(当浏览器选项卡关闭时，该数据将被删除)。
这是我的钢笔。
<div id="Notice">
<span title="remove this until browser tab is closed"><u>dismiss</u>.</span>
</div>
<script>
$("#Notice").click(function() {
//set sessionStorage on click
sessionStorage.setItem("dismissNotice", "Hello");
$("#Notice").remove();
});
if (sessionStorage.getItem("dismissNotice"))
//When sessionStorage is set Do stuff...
$("#Notice").remove();
</script>
在window的帮助下可以检查。在'unload'事件的事件处理程序中关闭，但超时使用是必需的(所以结果不能保证如果SMTH延迟或阻止窗口关闭):
JSFiddle的例子(测试在最新的Safari, FF, Chrome, Edge和IE11)
var win = window.open('', '', 'width=200,height=50,left=200,top=50');
win.document.write(`<html>
<head><title>CHILD WINDOW/TAB</title></head>
<body><h2>CHILD WINDOW/TAB</h2></body>
</html>`);
win.addEventListener('load',() => {
document.querySelector('.status').innerHTML += '<p>Child was loaded!</p>';
});
win.addEventListener('unload',() => {
document.querySelector('.status').innerHTML += '<p>Child was unloaded!</p>';
setTimeout(()=>{
document.querySelector('.status').innerHTML += getChildWindowStatus();
},1000);
});
win.document.close()
document.querySelector('.check-child-window').onclick = ()=> {
alert(getChildWindowStatus());
}
function getChildWindowStatus() {
if (win.closed) {
return 'Child window has been closed!';
} else {
return 'Child window has not been closed!';
}
}
