如果在window.onbeforeunload事件中确认“是”，如何调用另一个Java脚本函数
[英]How can I call another Java Script function if I confirm Yes on window.onbeforeunload event
问题描述
How can I call another Java Script function if I confirm Yes on below window.onbeforeunload event. 
如果我在window.onbeforeunload事件下面确认是，如何调用另一个Java脚本函数。
function closeIt() {
return "You have attempted to leave this page. Are you sure you want to exit";
}
window.onbeforeunload = closeIt;
2 个解决方案
解决方案1
0 2015-03-10 10:48:01
How can I call another Java Script function if I confirm Yes on below window.onbeforeunload event.
If by "yes" you mean "Yes, leave" then you might be able to use the unload event on window . 如果用“是”表示“是，请离开”，那么您也许可以在window上使用unload事件。 Note that you can't do much of anything at that point. 请注意，此时您无法做任何事情。
If by "yes" you mean "Yes, stay on the page" then you can do that just by setting a timed callback with setTimeout . 如果用“是”表示“是，留在页面上”，则可以通过设置setTimeout的定时回调来实现。
Here's a complete example which records to local storage whether you left or stayed (tested on Firefox, Chrome, and IE11): 这是一个完整的示例，该记录将您离开还是停留在本地存储中（在Firefox，Chrome和IE11上测试）：
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Closing</title>
<style>
html {
box-sizing: border-box;
}
*, *:before, *:after {
box-sizing: inherit;
}
body {
font-family: sans-serif;
}
</style>
</head>
<body>
<script>
(function() {
display("foo = " + (localStorage.getItem("foo") || "<em>not set</em>"));
window.onbeforeunload = function() {
setTimeout(function() {
localStorage.setItem("foo", "stayed at " + new Date());
display("Stayed");
}, 10);
return "Really leave?";
};
if (window.addEventListener) {
window.addEventListener("unload", left, false);
} else if (window.attachEvent) {
window.attachEvent("onunload", left);
} else {
window.onunload = left;
}
function left() {
localStorage.setItem("foo", "left at " + new Date());
}
function display(msg) {
var p = document.createElement('p');
p.innerHTML = String(msg);
document.body.appendChild(p);
}
})();
</script>
</body>
</html>
解决方案2
0 2015-03-10 11:44:38
I believe you need the function 我相信你需要的功能
confirm(message)
Depending on what you click ("Ok" or "Cancel"), it returns a boolean value. 根据您单击的内容（“确定”或“取消”），它将返回一个布尔值。 After testing for this return value, you can take an action you want. 测试此返回值后，您可以执行所需的操作。
if(confirm("Are you sure?")) {
alert("Yes, you are!")};
} else {
alert("Why not?")
}
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