JS Smart to determine whether the browser is closed or refreshed code

Source: Internet
Author: User
Keywords Web page production Ajax javascript
Tags ajax browser closed code document html http javascript

JavaScript to determine whether the browser is closed or refreshed, actually feel that there is no practical, even as a reference to JS learning document it.

<! 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>js Intelligent Judgment Browser is closed or refreshed </title>
<meta http-equiv= "Content-type" content= "text/html;charset=gb2312" >
</head>
<body>
Close or refresh the browser try!
<script language= "JavaScript" >
Window.onbeforeunload=function () {
var n=window.event.screenx-window.screenleft;
var b=n>document.documentelement.scrollwidth-20;
if (b&&window.event.clienty<0| | Window.event.altKey) {
Alert ("Off");
}else{
Alert ("Refresh");
}
}
</script>
</body>
</html>

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