使用普通Javascript通过AJAX提交表单，而不使用Jquery get checked单选按钮值

var form = document.getElementById('myForm');
var radioButton = document.querySelector('input[name="myRadioButton"]:checked');

var xhr = new XMLHttpRequest();

xhr.open('POST', 'your-url', true);

xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

var formData = new FormData(form);

formData.append('radioButtonValue', radioButton.value);

xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    // 处理响应数据
  }
};

xhr.send(formData);

var form = document.getElementById('myForm');
var radioButton = document.querySelector('input[name="myRadioButton"]:checked');

var xhr = new XMLHttpRequest();
xhr.open('POST', 'your-url', true);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

var formData = new FormData(form);
formData.append('radioButtonValue', radioButton.value);

xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    // 处理响应数据
  }
};

xhr.send(formData);