在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/jquerymobile/1.4.5/jquery.mobile-1.4.5.min.css">
<script src="https://apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="https://apps.bdimg.com/libs/jquerymobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
<script>
$(document).on("pagebeforeload",function(event,data){
  alert("pagebeforeload 事件触发!\nURL 即将载入: " + data.url);
});
</script>
</head>
<body>

<div data-role="page">
  <div data-role="header">
    <h1>头部文本</h1>
  </div>

  <div data-role="main" class="ui-content">
    <a href="externalpage.html">外部页面</a>
  </div>

  <div data-role="footer">
    <h1>底部文本</h1>
  </div>
</div> 

</body>
</html>
源代码

动行结果
