计时器结束后，表单自动提交功能不起作用，并且希望在计时器中提交时间

Question

我想创建一个简单的测验站点，用户可以在指定的时间（例如5秒钟）内在该时间之后自动进行测验。如果用户在5个问题中填写了2个问题，那么在倒计时结束后，只有这2个问题将被提交到数据库中。另外，我想在单击提交按钮时存储倒数。例如，如果用户在倒计时时间为4秒时提交表单，则该4秒时间将存储在mySQL数据库中。倒数计时器并在计时器结束后自动提交，但数据库中没有存储任何数据。我的代码：

 <form action="form_data.php" method="post" class="form" id="form" name="form">
            <div class="col-md-12">

        <span id="remain"></span>

                <h2 class="text-center">Name of the President?</h2>
                <div class="row">

                    <div class="col-md-4 ">


                        <div class="form-check vote">
                            <label class="form-check-label"><input type="radio" class="form-check-input " name="president" value="1" required>A</label>
                        </div>

                    </div>
                    <div class="col-md-4 ">


                        <div class="form-check vote">
                            <label class="form-check-label"><input type="radio" class="form-check-input " name="president" value="2" required>B</label>
                        </div>
                    </div>
                </div>



                <div class="row vote_submit">

                    <div class="col-md-6">
                        <input type="submit" name="go" class="form-control"  value="Submit" />
                    </div>
                    <div class="col-md-6">
                        <input type="reset" class="form-control btn btn-danger" value="Reset">
                    </div>



                </div>
            </div>

        </form>
        <script type="text/javascript">
            window.onload=counter;
            function counter()
            {
            seconds = 5;
            countDown();
            }   

            function countDown(){
            document.getElementById("remain").innerHTML=seconds;
            setTimeout("countDown()",1000);
                if(seconds == 0)
                    {
                        document.form.submit();
                    }else {
                    seconds--;      
                    }
            }

        </script>

form_data.php文件：

<?php
    if(isset($_POST["go"])){


    //Database Connection Establish
    include "dbconnect.php";

    //Variables for Form Data


    $president = $DBcon->real_escape_string($_POST['president']);


    $dataTime = date("Y-m-d H:i:s");


    //Insert Form Data into database
    $insert = $DBcon->query("INSERT into vote (presidentcreated) VALUES ('$president','$dataTime')"); 
    if($insert){
        echo "<h1>Thank You for Your vote</h1>";
    }else{
        echo "Error".mysqli_error($DBcon);
    } 
}


?>