如何使用 JavaScript 实现一个简单的数据验证功能？

下面是一段 JavaScript 代码，实现一个简单的数据验证功能：

// Add event listener to the form 
document.querySelector('form').addEventListener('submit', function(event) {

  // Get the data from the form 
  let name = document.querySelector('#name').value;
  let email = document.querySelector('#email').value;
  
  // Validation rules
  let validName = /^[a-zA-Z ]+$/.test(name);
  let validEmail = /^\S+@\S+\.\S+$/.test(email);

  // If both rules are satisfied, submit the form 
  if (validName && validEmail) {
    alert('form submitted successfully!');
  } else {
    event.preventDefault();
    alert('invalid information provided');
  }
});