网站网页关闭页面时提示框关闭网页弹出窗口代码

<title>冷月教学网网站关闭提示网页代码https://www.kubbs.cn</title>
<script type="text/javascript" src="_javascript/jquery.js"></script>

代码在这里开始：冷月教学网网站关闭提示网页代码https://www.kubbs.cn

<script>
var jq=$;
function startrequest(url, arg, syn, cation) {
if (syn == 1)
syn = false;
else
syn = true;

createxmlhttp();
xmlhttp.open("POST", url, syn);
xmlhttp.setRequestHeader("Content-Type",
"application/x-www-form-urlencoded;");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
cation(xmlhttp.responseText);
}
};
xmlhttp.send(arg);
}

var xmlhttp;
function createxmlhttp() {
if (typeof (XMLHttpRequest) != "undefined") {
xmlhttp = new XMLHttpRequest();
} else {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
}
}
}
}
window.onbeforeunload=function()
{
if(document.all)
{
if(event.clientY<0)
return "重要提醒：让你找到回家的路 冷月教学网网站关闭提示网页代码https://www.kubbs.cn";
}else
return "重要提醒：让你找到回家的路 冷月教学网网站关闭提示网页代码https://www.kubbs.cn";
}
</script>