从其他php文件访问java脚本变量

<!-- index.html -->
<form action="process.php" method="post">
    <input type="text" id="myInput" name="myInput">
    <input type="submit" value="Submit">
</form>

<script>
    document.getElementById('myInput').value = 'someValue'; // 设置JavaScript变量的值
</script>

// process.php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $myInput = $_POST['myInput'];
    echo "Received value: " . htmlspecialchars($myInput);
}
?>

<!-- index.html -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
    $(document).ready(function(){
        var myVariable = 'someValue';
        $.ajax({
            url: 'process.php',
            type: 'post',
            data: { myVariable: myVariable },
            success: function(response) {
                console.log(response);
            }
        });
    });
</script>

// process.php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $myVariable = $_POST['myVariable'];
    echo "Received value: " . htmlspecialchars($myVariable);
}
?>

// data.php
<?php
$data = array('key' => 'value');
header('Content-Type: application/json');
echo json_encode($data);
?>

<!-- index.html -->
<script>
    fetch('data.php')
        .then(response => response.json())
        .then(data => console.log(data));
</script>