javascript - _POST不抓取数据

Question

我正在开发登录系统，但在帖子论坛方面遇到问题。这是我所拥有的，我觉得我已经尝试了几乎所有的方法，但没有运气。

我尝试重命名这些名称，并回显信息。用户名工作正常，这是我遇到问题的隐藏密码。

    <script>
        function changeFormLogin() {
            var pass = document.getElementById('getPass').value;
            var username  = document.getElementById('username').value;
            var getSalt = <?php echo $salt ?>;
            var hashpass = sha256(getSalt+pass);

            document.getElementById("hiddenPass").value = hashpass;
            document.getElementById("hiddensalt").value = getSalt;
        }     
    </script>

    <h2>Sign Up Here</h2>
    <form onsubmit="changeFormLogin()" action="tryLogin.php" METHOD="POST">
        <p>Email</p>
        <input id="username" type="email" name="username" placeholder="Enter Email" value = "<?php echo $username ?>" required>
        <p>Password</p>
        <input id="getPass" type="password" name="password" placeholder="••••••" required>
        <!-- Add two hidden fields right here -->
        <input id="hiddenPass" type="hidden" name="hiddenPass1" value="">
        <input id="hiddensalt" type="hidden" name="hiddensalt" value="">
        <input type="submit" name="login" value="Sign In">
    </form>

这是 PHP 文件:

   <?php
   include_once('connect.php');


   $username = $_POST['username'];
   $password = $_POST['hiddenPass1'];  
   $salt = $_POST['hiddensalt'];
   $userid = "";
   $valid = "";

Answer 1

您缺少在 changeFormLogin 函数中发送表单以提交表单，不要忘记将 id 添加到您的表单

document.getElementById("yourFormId").submit();