// 示例：使用React重构邮件列表项
function EmailItem({ email, onSelect }) {
  return (
    <div className="email-item" onClick={() => onSelect(email.id)}>
      <div className="sender">{email.sender}</div>
      <div className="subject">{email.subject}</div>
      <div className="preview">{email.preview}</div>
      <div className="date">{formatDate(email.date)}</div>
    </div>
  );
}

// 智能搜索功能示例
function advancedSearch(query) {
  return emails.filter(email => {
    return (
      email.subject.includes(query) ||
      email.body.includes(query) ||
      email.sender.includes(query) ||
      // 添加更多搜索维度...
    );
  });
}