如何将类组件转换为功能无状态组件？

Question

我正在尝试将类组件转换为功能组件。但这对我来说有点困难。你可以帮帮我吗？

我试图这样做，但是没有用：

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import MovieCardsList from './MovieCardsList';

function (
  props.profiles
  props.movies
  props.users
) {
 return (
      <div>
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">ReactND - Coding Practice</h1>
        </header>
        <h1>How Popular is Your Favorite Movie?</h1>
        <MovieCardsList profiles={profiles} movies={movies} users={users} />
      </div>
    ); 
  }

export default App;

这里是代码的一部分：

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import MovieCardsList from './MovieCardsList';

class App extends Component {
  render() {
    return (
      <div>
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">ReactND - Coding Practice</h1>
        </header>
        <h1>How Popular is Your Favorite Movie?</h1>
        <MovieCardsList profiles={profiles} movies={movies} users={users} />
      </div>
    );
  }
}

export default App;

我接近解决方案了吗？任何帮助，我都感激不尽。预先感谢。

Answer 1

进行最少的更改：

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import MovieCardsList from './MovieCardsList';

function App(props) {
   return (
      <div>
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">ReactND - Coding Practice</h1>
        </header>
        <h1>How Popular is Your Favorite Movie?</h1>
        <MovieCardsList profiles={props.profiles} movies={props.movies} users={props.users} />
      </div>
    ); 
  }

export default App;

您还可以使用{...props}对象传播在MovieCardsList上设置它们，或使用对象解构({ profiles, movies, users })替换(props)。我个人将如何做：

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
import MovieCardsList from './MovieCardsList';

export default ({ profiles, movies, users }) => (
  <div>
    <header className="App-header">
      <img src={logo} className="App-logo" alt="logo" />
      <h1 className="App-title">ReactND - Coding Practice</h1>
    </header>
    <h1>How Popular is Your Favorite Movie?</h1>
    <MovieCardsList profiles={profiles} movies={movies} users={users} />
  </div>
);

Answer 2

要么接受道具作为参数：

function App = (props) => {
    cosnt {profiles, movies, users} = props
    return <div/>
}

或立即解构它们

function App = ({profiles, movies, users}) => {
    return <div/>
}

完整代码：

import React from 'react';
import logo from './logo.svg';
import './App.css';
import MovieCardsList from './MovieCardsList';

function App = ({profiles, movies, users}) => {
    return (
      <div>
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">ReactND - Coding Practice</h1>
        </header>
        <h1>How Popular is Your Favorite Movie?</h1>
        <MovieCardsList profiles={profiles} movies={movies} users={users} />
      </div>
    );
}

导出默认应用程序；