React代码重构指南：如何改善前端应用的代码结构和可读性

// UserCard.js
import React from 'react';
import Avatar from './Avatar';
import Name from './Name';
import Description from './Description';

const UserCard = ({ user }) => {
  return (
    <div>
      <Avatar avatarUrl={user.avatar} />
      <Name name={user.name} />
      <Description description={user.description} />
    </div>
  );
}

export default UserCard;

// Avatar.js
import React from 'react';

const Avatar = ({ avatarUrl }) => {
  return <img src={avatarUrl} alt="User Avatar" />;
}

export default Avatar;

// Name.js
import React from 'react';

const Name = ({ name }) => {
  return <h2>{name}</h2>;
}

export default Name;

// Description.js
import React from 'react';

const Description = ({ description }) => {
  return <p>{description}</p>;
}

export default Description;

// Counter.js
import React, { useState } from 'react';
import Display from './Display';
import Button from './Button';

const Counter = () => {
  const [count, setCount] = useState(0);

  const increment = () => {
    setCount(count + 1);
  };

  const decrement = () => {
    setCount(count - 1);
  };

  return (
    <div>
      <Display count={count} />
      <Button onClick={increment}>+</Button>
      <Button onClick={decrement}>-</Button>
    </div>
  );
}

export default Counter;

// Display.js
import React from 'react';

const Display = ({ count }) => {
  return <p>{count}</p>;
}

export default Display;

// Button.js
import React from 'react';

const Button = ({ children, onClick }) => {
  return <button onClick={onClick}>{children}</button>;
}

export default Button;

// UserList.js
import React, { useState, useEffect } from 'react';

const UserList = () => {
  const [users, setUsers] = useState([]);

  useEffect(() => {
    fetch('https://api.example.com/users')
      .then(response => response.json())
      .then(data => setUsers(data));
  }, []);

  return (
    <ul>
      {users.map(user => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  );
}

export default UserList;