JavaScript：只使用时间的倒计时计时器

抱歉，我知道这个问题已经被分别问过了，但没有一个问题/答案符合我的确切需要。我尝试过写作，谷歌搜索，甚至Stackoverflow。 我的用例是使用JavaScript启动一个计时器（使用PHP从数据库中获取），以便学生单击“开始测试”后立即进行测试，当时间到了，提交并整理结果，除非学生提前提交。 教师以“2:30:45”格式输入考试的持续时间，持续2小时30分钟45秒（也保存到数据库中）。我需要这个倒计时，直到它的“0:00:00”之前，自动提交。

---

非常感谢。

这是我的第一个答案，我仍然习惯于StackOverflow。如果我做错了，请告诉我

假设教师的输入时间为

limit

。 要获取总秒数，请执行以下操作：

var hours = limit.split(":")[0];
var mins = limit.split(":")[1];
var secs = parseInt(limit.split(":")[2]);
var totalSecs = 3600*hours+60*mins+secs;

现在您已经有了总秒数，您可以在totalSecs之后提交测试：

setTimeout(function(){
    document.querySelector("YOUR FORM ID OR CLASS, ETC.").submit();
},totalSecs*1000);

如果要显示留给学生的剩余时间：

// Suppose you have a <p id="timeLeft"></p> showing the time left
setInterval(function(){
    var hours = 0;
    var mins = 0;
    var secs = 0;

    var numSecs = totalSecs; // Temporary variable

    // Convert seconds to HH:MM:SS

    while(numSecs>3600){// 1 hour = 3600 seconds, so if numSecs>3600, we can 'take out an hour'
        hours++;
        numSecs -= 3600;
    }

    while(numSecs>60){// 1 minute = 60 seconds, so if numSecs>60, we can 'take out a minute'
        mins++;
        numSecs -= 60;
    }

    // By now, numSecs will be smaller than 60. numSecs is now the # of seconds

    secs = numSecs;

    totalSecs--; // Decrease by one second



    // Update the time
    document.getElementById("timeLeft").innerHTML = ""+hours+":"+mins+":"+secs+" left!";
},1000); // Update the time left every second

如果您想要更多的“安全性”，您可以使用。它使代码不可读，因此很难修改。此外，我链接的站点有禁用调试器的选项，这意味着您无法对其进行F12或检查。如果我混淆了上面的代码，我们可以得到这样一个不可读的脚本：

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---

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我将使用一个javascript函数异步更新剩余时间。我还将编写一个javascript，异步更新学生提交的内容，以减少丢失答案的可能性（此外，您还可以通过这种方式获得更有趣的统计数据，如学生花在答案上的时间）
将任何时间转换为秒，并使用
setTimeout（）
调用表单提交函数的函数。但是，任何学生都可以禁用它，并可以随心所欲地工作-JavaScript是客户端的，很容易缓解。谢谢，但你能给我举个例子吗？还有，有没有更好的方法确保学生不能调节计时器？
设置超时（函数（）{document.getElementById（“the_form”）.submit（）}，9045000）
（JS计时器使用毫秒）或者类似的东西…但我可能只是使用JS作为屏幕上剩余时间的指示器，并在数据库中为该用户/测试指定一个实际的测试过期日期时间。如果你想要“安全”，你应该只检查提交表单的服务器上的时间。仅此而已。不需要混淆。绝对正确！
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