js监听事件
需要在浏览器关闭（浏览器程序关闭及浏览器标签关闭）时，使用异步方法向服务器端回发一些信息。
HTML code
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>HTMLPage3</title>
<script language="javascript" type="text/javascript">
var xmlHttp; www.zzzyk.com
function createHttpRequest()
{
if (!window.XMLHttpRequest)
{
window.XMLHttpRequest = function()
{
var progIDs = [ 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP.2.6',
'Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'MSXML.XMLHTTP' ];
for (var i = 0; i < progIDs.length; i++)
{
try
{
xmlHttp = new ActiveXObject(progIDs[i]);
break;
}
catch (ex) { }
}
}
}
else
{
xmlHttp = new XMLHttpRequest();
}
}
function doSearch()
{
createHttpRequest();
var url = "myPage.aspx?id="
if(document.getElementById("txt") != null)
{
url = url + escape(document.getElementById("txt").value)
}
else
{
url = url + "-1";
}
if(xmlHttp != null)
{
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
//alert("Send Complete!");
}
}
window.onbeforeunload = function()
{
doSearch();
}
</script>
</head>
<body>
<h1>HTMLPage3</h1><br />
<input type="text" id="txt" />
<input type="button" id="btn" value="Click" onclick="doSearch();" />
</body>
</html>
补充：web前端 , JavaScript ,
