const UserModule = (function () {
  let users = [];
<p>function addUser(name) {
users.push({ id: Date.now(), name });
}</p><p>function getAll() {
return [...users];
}</p><p>return {
addUser,
getAll
};
})();</p>

class EventHub {
  constructor() {
    this.events = {};
  }
<p>on(event, callback) {
if (!this.events[event]) this.events[event] = [];
this.events[event].push(callback);
}</p><p>emit(event, data) {
if (this.events[event]) {
this.events[event].forEach(cb => cb(data));
}
}
}</p><p>// 使用示例
const hub = new EventHub();
hub.on('userAdded', user => console.log('通知：新用户加入', user));
hub.emit('userAdded', { name: 'Alice' });</p>

const validationStrategies = {
  isRequired: value => value !== '' && value !== null,
  isEmail: value => /\S+@\S+\.\S+/.test(value),
  minLength: (value, len) => value.length >= len
};
<p>function validate(value, rules) {
for (let rule in rules) {
const [strategy, param] = rule.split(':');
const args = param ? [value, param] : [value];
if (!validationStrategies<a href="https://www.php.cn/link/1f1bf7748e7e06682e348b22a722266a">strategy</a>) {
return false;
}
}
return true;
}</p>

function ComponentFactory(type, config) {
  switch (type) {
    case 'button':
      return new ButtonComponent(config);
    case 'input':
      return new InputComponent(config);
    default:
      throw new Error(`不支持的组件类型: ${type}`);
  }
}