JavaScript不会在PHP头调用后运行

我正在尝试使用PHP头/甚至PHP内部的JavaScript变通调用重定向到我的clients.PHP网页

问题是PHP头文件/变通方法完美地加载了网页，但Javascript仍然没有运行

另外需要注意的是，在页眉甚至Javascript重定向到页面后，尝试刷新页面将不会加载Javascript。只有在网页和返回clients.php之间切换，Javascript才会真正运行

我也试过：

但是没有用

这里是我的代码片段，只是因为它相当长

clients.php

script.php

请注意，clients.php和script.php不在同一个文件中

按里格斯要求

此脚本仅链接会话，同时还检查用户的登录有效性

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消息传递确实与另一个文件“dashboard.php”的头一起工作，但从script.php重定向到dashboard.php不会产生消息，因此仍然会产生暗示。

由于您尚未启动会话，因此没有定义tmp JavaScript变量。包括会话启动；在代码的顶部

var-tmp=； alerttmp+h； $document.readyfunction{

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令我惊讶的是，问题根本不在于Javascript，也不在于帖子建议的定位，而在于我的PHP和调用$\u membersname

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对于以后解决问题的建议，请确保没有输出任何错误，即使PHP没有找到任何错误。这是来自一个尚未声明的变量。

这可能是一个愚蠢的问题，但是…你确定它会进入if语句吗？我看不到在代码中的任何地方启动会话。在测试之后立即添加到文件顶部例如，你打开PHP标签，或者只是查看你的PHP错误日志。因此，你必须确保在调用header之前没有输出。意外的错误消息，甚至在调用header之前有一个空格

<!-- Bootstrap core JavaScript-->
<script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
<!-- Core plugin JavaScript-->
<script src="vendor/jquery-easing/jquery.easing.min.js"></script>
<!-- Page level plugin JavaScript-->
<script src="vendor/chart.js/Chart.min.js"></script>
<script src="vendor/datatables/jquery.dataTables.js"></script>
<script src="vendor/datatables/dataTables.bootstrap4.js"></script>
<!-- Custom scripts for all pages-->
<script src="js/sb-admin.min.js"></script>
<!-- Custom scripts for this page-->
<script src="js/sb-admin-datatables.min.js"></script>
<script src="js/sb-admin-charts.min.js"></script>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js" ty    pe="text/javascript"></script>
    <link href="../../css/toastr.css" rel="stylesheet"/>
    <script src="../../js/toastr.js"></script>
    <script type="text/javascript">
            var tmp = "<?php $tmp = $_SESSION['message_success']; echo "$tmp"; ?>";
            alert(tmp + " h");
            $( document ).ready(function() {
                    <?php
                        if($_SESSION['sysLogin'] == "success") {
                            $_SESSION['sysLogin'] = "";
                            $user = $_SESSION['user'];
                            echo "toastr.success('Welcome $user', 'User has logged in');";
                        }
                        if($_SESSION['message_success'] != "") {
                            $msg = $_SESSION['message_success'];
                            $_SESSION['message_success'] = "";
                            echo "toastr.success('$msg', 'Success!');";
                        }
                        if($_SESSION['message_error'] != "") {
                            $msg = $_SESSION['message_error'];
                            $_SESSION['message_error'] = "";
                            echo "toastr.error('$msg', 'Error!');";
                        }
                        if($_SESSION['message_warning'] != "") {
                            $msg = $_SESSION['message_warning'];
                            $_SESSION['message_warning'] = "";
                            echo "toastr.warning('$msg', 'Warning!');";
                        }
                     ?>
            });
    </script>
    </div>
    </body>

    </html>

  if($update_statement) {
      $_SESSION['message_success'] = "$_membername's Careplan has been successfully updated.";
      echo "<script type='text/javascript'>window.location.href = '../clients.php';</script>";
      //header("Location:". $redirect);
      //exit();
    }

<?php
session_start();
$message="";
if(isset($_POST["login"])) {
    $redirect = NULL;
    if($_POST['redirect'] != '') {
        $redirect = $_POST['redirect'];
    }
    if(empty($_POST['username']) || empty($_POST['password'])) {
        $message = "Both fields must be filled out.";
        $_SESSION['sysLogin'] = "$message";
        header("location: ../login.php?redirect=" . urlencode($redirect));
    } else {

        require('server_connection.inc');
        $connection = connect_to_db(DB_SERVER, DB_UN, DB_PWD, DB_NAME);

        $user=mysqli_real_escape_string($connection, $_POST['username']);
        $pass=mysqli_real_escape_string($connection, $_POST['password']);
        $statement = "select * from Credentials where UserName='$user' AND Password='$pass';";
        $result = $connection->query($statement);

        if($result->num_rows == 1) {
            // lets determine the type of user that logged in
            // if not employee but CEO, Manager, ETC, its an Admin
            $employeeid = ($result->fetch_assoc())["EmployeeID"];
            $check = "select Employees.Position, Employees.Name, Employees.ID from Credentials, Employees where (Credentials.EmployeeID = Employees.ID) AND Employees.ID = '$employeeid';";
            $result_two = $connection->query($check);
            if($result->num_rows == 1) {
                $the_row = $result_two->fetch_assoc();
                if($the_row["Position"] == "Employee") {
                    $name = $the_row["Name"];
                    $the_id = $the_row['ID'];
                    $_SESSION['logon'] = true;
                    $_SESSION['user'] = "$name";
                    $_SESSION['type'] = "employee";
                    $_SESSION['sysLogin'] = "success";
                    $_SESSION['user_id'] = $the_id;
                    mysqli_close($conection);
                    if($redirect) {
                          header("Location:". $redirect);
                    } else {
                        header("location: ../index.php");
                    }
                    exit();
                } else if($the_row["Position"] == "CEO" || $the_row["Position"] == "Manager") {
                    $name = $the_row["Name"];
                    $the_id = $the_row['ID'];
                    $_SESSION['logon'] = true;
                    $_SESSION['user'] = "$name";
                    $_SESSION['type'] = "admin";
                    $_SESSION['sysLogin'] = "success";
                    $_SESSION['user_id'] = $the_id;
                    mysqli_close($conection);
                    if($redirect) {
                            header("Location:". $redirect);
                    } else {
                        header("location: ../index.php");
                    }
                    exit();
                }
            } else {
                $message = "Unable to Parse Employee. Please contact your sites Administrator.";
                $_SESSION['sysLogin'] = "$message";
                mysqli_close($conection);
                header("location: ../login.php?redirect=" . urlencode($redirect));
            }
        } else if($result->num_rows == 0){
            $message = "Incorrect username or password";
            $_SESSION['sysLogin'] = "$message";
            mysqli_close($conection);
            header("location: ../login.php?redirect=" . urlencode($redirect));
        } else {
            $message = "Database Login Error. Too many retrieved accounts. Please contact your sites Administrator.";
            $_SESSION['sysLogin'] = "$message";
            mysqli_close($conection);
            header("location: ../login.php?redirect=" . urlencode($redirect));
        }
    }
}

function write_to_log($message) {
    $file = fopen("logfile.txt", "w") or die("Unable to open file!");
    fwrite($file, "$message\n");
    fclose($file);
}

function connect_to_db($server, $username, $pwd, $dbname) {
    $conn = mysqli_connect($server, $username, $pwd);
    if(!$conn) {
            echo "" . mysqli_error($conn);
            exit;
    }
    $dbh = mysqli_select_db($conn, $dbname);
    if(!$dbh) {
        echo "" . mysqli_error($conn);
        exit;
    }
    return $conn;
}
?>