禁用提交按钮，直到它验证所有数字字段都有效

<form id="myForm">
  <input type="number" id="field1" required>
  <input type="number" id="field2" required>
  <!-- 其他表单字段 -->
  <button type="submit" id="submitBtn" disabled>提交</button>
</form>

// 监听数字字段的输入事件
document.getElementById('field1').addEventListener('input', validateFields);
document.getElementById('field2').addEventListener('input', validateFields);

// 验证字段有效性的函数
function validateFields() {
  const field1 = parseInt(document.getElementById('field1').value);
  const field2 = parseInt(document.getElementById('field2').value);
  
  if (Number.isInteger(field1) && Number.isInteger(field2)) {
    document.getElementById('submitBtn').disabled = false;
  } else {
    document.getElementById('submitBtn').disabled = true;
  }
}