获取表单中的值到php，因为它是递增和递减的。

<form id="myForm">
  <input type="number" name="value1" id="value1" value="0">
  <input type="number" name="value2" id="value2" value="0">
  <button type="button" onclick="submitForm()">提交</button>
</form>

function submitForm() {
  var value1 = document.getElementById("value1").value;
  var value2 = document.getElementById("value2").value;

  // 使用Ajax将表单值传递给PHP脚本
  var xhr = new XMLHttpRequest();
  xhr.open("POST", "process.php", true);
  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      // 处理PHP脚本的返回结果
      var response = xhr.responseText;
      console.log(response);
    }
  };
  xhr.send("value1=" + value1 + "&value2=" + value2);
}

<?php
$value1 = $_POST['value1'];
$value2 = $_POST['value2'];

// 对表单值进行递增和递减操作
$increment = $value1 + 1;
$decrement = $value2 - 1;

// 返回结果
$response = "递增结果：" . $increment . "，递减结果：" . $decrement;
echo $response;
?>