<html>
<head>
<link rel="stylesheet" href="https://libs.baidu.com/jquerymobile/1.4.2/jquery.mobile.min.css">
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script src="https://libs.baidu.com/jquerymobile/1.4.2/jquery.mobile.min.js"></script>
<script>
$(document).on("pagebeforeload",function(event,data){
alert("pagebeforeload event fired!\nURL that is about to be loaded: " + data.url);
});
</script>
</head>
<body>
<div data-role="page">
<div data-role="header">
<h1>Header Text</h1>
</div>
<div data-role="content">
<a href="/demo/externalpage.html">External page</a>
</div>
<div data-role="footer">
<h1>Footer Text</h1>
</div>
</div>
</body>
</html>