我有一个非常具体的问题。我浏览了整个互联网以寻求解决方案，但没有发现任何有用的方法。我有这个HTML代码： <form action="/timer.php" method="POST"> <span>First Name:</span><input name="firstname" type="text" /> <input type="submit" value="Submit"> </form>当我通过输入我的名字进入timer.php站点时，新选项卡应计算在此页面上花费的时间，并使用我输入的名称将其保存在任何位置（文件或数据库）并每半小时自动保存一次。目前的HTML<html><html><head><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script><script>function call_ajax(pageOpen, firstname){pageClose =new Date(); //count spent minutes and seconds on pageminutes= pageClose.getMinutes() - pageOpen.getMinutes(); seconds= pageClose.getSeconds() - pageOpen.getSeconds(); //send the spent minutes, seconds and firstname to timer.php file$.ajax({ url: "timer.php",data: {'minutes': Math.abs(minutes), 'seconds':Math.abs(seconds), 'firstname':firstname}})}$(document).ready(function() {//When open the page get the current timevar pageOpen = new Date();//call the ajax to send the request in timer.php every 30 minsetInterval(function(){var firstname = $('#firstname').val();call_ajax(pageOpen, firstname); }, 1000 * 60 * 30);$("button").click(function(e){e.preventDefault();//call the ajax to send the request in timer.php on click the buttonvar name = $('#firstname').val();call_ajax(pageOpen, name);});});</script</head><body><form action="/timer.php" method="POST" name="timer" > <span>First Name:</span><input name="firstname" type="text" id="firstname" /><input type="submit" value="Submit"></form></body></html>我的timer.php：<?phpheader('Content-Type: text/html; charset=Windows-1250');$firstName = $_POST['firstname'];$minutes = $_POST['minutes'];$seconds = $_POST['seconds'];?><html><head><meta http-equiv="Content-type" content="text/html; charset=Windows-1250" /></head><body>
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