使用XHR提交HTML表单在基于iOS/iPadOS的设备上不起作用

const formData = new FormData();
formData.append('username', 'John');
formData.append('password', '123456');

fetch('https://example.com/api/submit', {
  method: 'POST',
  body: formData
})
.then(response => {
  // 处理响应
})
.catch(error => {
  // 处理错误
});

const form = document.createElement('form');
form.style.display = 'none';
form.method = 'POST';
form.action = 'https://example.com/api/submit';

const usernameInput = document.createElement('input');
usernameInput.type = 'text';
usernameInput.name = 'username';
usernameInput.value = 'John';
form.appendChild(usernameInput);

const passwordInput = document.createElement('input');
passwordInput.type = 'password';
passwordInput.name = 'password';
passwordInput.value = '123456';
form.appendChild(passwordInput);

document.body.appendChild(form);
form.submit();