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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
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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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