使用ajax在点击按钮时调用php函数并解析参数

<button id="myButton">点击按钮</button>

document.getElementById("myButton").addEventListener("click", function() {
  var param1 = "参数1的值";
  var param2 = "参数2的值";
  
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "myphpfile.php", true);
  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      // 请求成功，解析返回的数据
      var response = JSON.parse(xhr.responseText);
      // 处理返回的数据
      console.log(response);
    }
  };
  xhr.send("param1=" + param1 + "&param2=" + param2);
});

<?php
  $param1 = $_POST["param1"];
  $param2 = $_POST["param2"];
  
  // 执行相应的函数，处理参数
  // ...
  
  // 返回处理结果
  $response = array("message" => "处理成功");
  echo json_encode($response);
?>