如何将json格式的FormData文件提交到服务器php

<form id="myForm">
  <input type="text" name="name" value="John">
  <input type="email" name="email" value="john@example.com">
  <input type="submit" value="Submit">
</form>

<script>
  document.getElementById("myForm").addEventListener("submit", function(event) {
    event.preventDefault(); // 阻止表单默认提交行为

    var formData = new FormData(this);
    var jsonData = {};

    for (var pair of formData.entries()) {
      jsonData[pair[0]] = pair[1];
    }

    var jsonString = JSON.stringify(jsonData);

    // 发送JSON数据到服务器
    var xhr = new XMLHttpRequest();
    xhr.open("POST", "submit.php", true);
    xhr.setRequestHeader("Content-Type", "application/json");
    xhr.send(jsonString);
  });
</script>

<?php
  $jsonString = file_get_contents('php://input');
  $jsonData = json_decode($jsonString, true);

  // 处理JSON数据
  $name = $jsonData['name'];
  $email = $jsonData['email'];

  // 进行其他操作，如将数据存储到数据库等

  // 返回响应
  $response = array('status' => 'success');
  echo json_encode($response);
?>