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
window.onbeforeunload = function ()
{
if (isProcess > 0)
{
return true;
}
else
{
//do something
}
};
此功能在浏览器运行过程中关闭窗口或刷新页面时显示确认对话框。该函数适用于所有浏览器。你必须在ajax进程中设置isProcess var。
其他回答
Sorry, I was not able to add a comment to one of existing answers, but in case you wanted to implement a kind of warning dialog, I just wanted to mention that any event handler function has an argument - event. In your case you can call event.preventDefault() to disallow leaving the page automatically, then issue your own dialog. I consider this a way better option than using standard ugly and insecure alert(). I personally implemented my own set of dialog boxes based on kendoWindow object (Telerik's Kendo UI, which is almost fully open-sourced, except of kendoGrid and kendoEditor). You can also use dialog boxes from jQuery UI. Please note though, that such things are asynchronous, and you will need to bind a handler to onclick event of every button, but this is all quite easy to implement.
然而，我同意缺少真正的关闭事件是很糟糕的:例如，如果你想在真正关闭的情况下才在后端重置会话状态，这是一个问题。
onunload是Chrome的答案。根据caniuse它的交叉浏览器。但并非所有浏览器的反应都一样。
window.onunload = function(){
alert("The window is closing now!");
}
developer.mozilla.org
这些事件在窗口卸载其内容和资源时触发。
铬:
Onunload只在页面关闭时执行。它甚至不会在页面刷新和导航到另一个页面时执行。
Firefox v86.0版本:
它根本不会执行。页面刷新，导航离开，关闭浏览器标签，关闭浏览器，什么都没有。
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>
简单的解决方案
window.onbeforeunload = function () {
return "Do you really want to close?";
};
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!';
}
}
