我需要帮助插入数据到数据库使用php，ajax，javascript

<form id="myForm">
  <input type="text" name="name" placeholder="姓名">
  <input type="text" name="email" placeholder="邮箱">
  <button type="submit">提交</button>
</form>

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

  var formData = new FormData(this); // 获取表单数据
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "insert.php", true); // 发送POST请求到insert.php
  xhr.onreadystatechange = function() {
    if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
      // 请求成功处理
      console.log(xhr.responseText);
    }
  };
  xhr.send(formData); // 发送表单数据
});

<?php
$servername = "数据库主机名";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名称";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
  die("连接失败: " . $conn->connect_error);
}

// 获取表单数据
$name = $_POST["name"];
$email = $_POST["email"];

// 插入数据到数据库
$sql = "INSERT INTO 表名 (name, email) VALUES ('$name', '$email')";
if ($conn->query($sql) === TRUE) {
  echo "数据插入成功";
} else {
  echo "数据插入失败: " . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>