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当页面离开时，判断页面的内容是否修改，如果修改，则提示是否保存，否则直接离开。
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<!DOCTYPE html public "-//w3c//dtd html 4.0 transitional//EN">
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html;charset=GBK">
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-store">
<meta http-equiv="expires" content="0">
<script language="javascript"src="jquery.js"></script>
<script language="javascript" src="jquery_validate/jquery.metadata.js"></script>
<script language="javascript" src="jquery_validate/jquery.validate.js"></script>
</head>
<script language="JavaScript">
//绑定beforeunload事件
window.onbeforeunload=function(){
var b=$("#aaaa").val();
var f="";
if(b!=""){
f="数据没有保存";
return f;
}else{
}
}
</script>
<body >
<h1>bbbbbbbbbbbbbbbbbbb
</h1>
<form method=post action="">
<input type="text" name="" id="aaaa" >
</form>
<a href="Noname1.html">Noname1.html</a>
</body>
</html>
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