将PHP变量的值发送到Javascript文档

<?php
$phpVariable = "Hello, World!";
?>

<script>
    var javascriptVariable = "<?php echo $phpVariable; ?>";
    console.log(javascriptVariable);
</script>

<?php
$phpVariable = "Hello, World!";
?>

<script>
    $.ajax({
        url: "getVariable.php",
        type: "POST",
        data: { variable: "<?php echo $phpVariable; ?>" },
        success: function(response) {
            console.log(response);
        }
    });
</script>

<?php
$phpVariable = "Hello, World!";
?>

<input type="hidden" id="phpVariable" value="<?php echo $phpVariable; ?>">

<script>
    var javascriptVariable = document.getElementById("phpVariable").value;
    console.log(javascriptVariable);
</script>