如何通过表单和全局变量的值在ajax上传递数据？

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

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

  // 获取表单字段的值
  var name = document.getElementById("name").value;
  var email = document.getElementById("email").value;

  // 将值存储在全局变量中
  window.formData = {
    name: name,
    email: email
  };

  // 发送ajax请求
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "服务器端URL", true);
  xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
  xhr.onreadystatechange = function() {
    if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
      // 请求成功处理
      console.log(xhr.responseText);
    }
  };
  xhr.send(JSON.stringify(window.formData));
});