React is a framework for building applications using JavaScript. React Native is an entire platform allowing you to build native, cross-platform mobile apps, and React.js is a JavaScript library you use for constructing a high performing UI layer. React.js is the heart of React Native, and it embodies all React’s principles and syntax, so the learning curve is easy. The platform is what gave rise to their technical differences. Like the browser code in React is rendered through Virtual DOM while React Native uses Native API’s to render components on mobile. React uses HTML and with React Native, you need to familiarize yourself with React Native syntax. React Native doesn’t use CSS either. This means you’ll have to use the animated API which comes with React Native to animate different components of your application.

最重要的是，React是为你的web界面构建动态，高性能，响应性UI的理想选择，而React Native是为了给你的移动应用程序一个真正的原生感觉。

雷夫:what-is-the-difference-between-react-js-and-react-native

React-Native是一个跨平台的应用程序，使用reactjs为所有平台(iOS, Android, Web, Windows, Mac, Linux)构建相同的代码。

实现上的区别在于reactjs使用HTML标记，而react-native使用react-native特定的组件。

React Js是一个Javascript库，你可以使用React开发和运行更快的web应用程序。

React Native让你只使用JavaScript构建移动应用程序，它用于移动应用程序开发。更多信息请点击这里https://facebook.github.io/react-native/docs/getting-started.html

React Native是一个使用React构建android和ios应用程序的框架。React是一个用于构建优秀网站的web框架。

反应:

React是一个声明性的、高效的、灵活的JavaScript库 构建用户界面。

本机反应:

React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components. With React Native, you don't build a “mobile web app”, an “HTML5 app”, or a “hybrid app”. You build a real mobile app that's indistinguishable from an app built using Objective-C or Java. React Native uses the same fundamental UI building blocks as regular iOS and Android apps. You just put those building blocks together using JavaScript and React. React Native lets you build your app faster. Instead of recompiling, you can reload your app instantly. With hot reloading, you can even run new code while retaining your application state. Give it a try - it's a magical experience. React Native combines smoothly with components written in Objective-C, Java, or Swift. It's simple to drop down to native code if you need to optimize a few aspects of your application. It's also easy to build part of your app in React Native, and part of your app using native code directly - that's how the Facebook app works.

基本上React是web应用视图的UI库，使用javascript和JSX, React native是React之上的一个额外库，用于iOS和Android设备的原生应用。

React代码示例:

import React, { Component } from 'react';
import ReactDOM from 'react-dom';

class Clock extends React.Component {
  constructor(props) {
    super(props);
    this.state = {date: new Date()};
  }

  componentDidMount() {
    this.timerID = setInterval(
      () => this.tick(),
      1000
    );
  }

  componentWillUnmount() {
    clearInterval(this.timerID);
  }

  tick() {
    this.setState({
      date: new Date()
    });
  }

  render() {
    return (
      <div>
        <h1>Hello, world!</h1>
        <h2>It is {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}

ReactDOM.render(
  <Clock />,
  document.getElementById('root')
);

React Native代码示例:

import React, { Component } from 'react';
import { Text, View } from 'react-native';

class WhyReactNativeIsSoGreat extends Component {
  render() {
    return (
      <View>
        <Text>
          If you like React on the web, you'll like React Native.
        </Text>
        <Text>
          You just use native components like 'View' and 'Text',
          instead of web components like 'div' and 'span'.
        </Text>
      </View>
    );
  }
}

有关React的更多信息，请访问facebook团队创建的官方网站:

https://reactjs.org/

有关React Native的更多信息，请访问下面的React Native网站:

https://reactnative.dev/

下面是React项目。

在Facebook，他们发明了React，这样JavaScript就可以使用虚拟DOM模型更快地操作网站DOM。

DOM完全刷新比React虚拟DOM模型慢，后者只刷新页面的一部分(即部分刷新)。

正如你从这个视频中了解到的，Facebook并没有发明React，因为他们立即意识到部分刷新会比传统的更快。最初，他们需要一种方法来减少Facebook应用程序的重建时间，幸运的是，这带来了部分DOM刷新。

React native只是React的结果。它是一个使用JavaScript构建原生应用程序的平台。

在使用React native之前，你需要掌握Java或Kotlin(适用于Android)， Swift或Objective-C(适用于iPhone和iPad)来创建原生应用。

使用React Native，可以在JavaScript中模仿原生应用程序的行为，最终，你将得到特定于平台的代码作为输出。如果需要进一步优化应用程序，甚至可以混合使用本机代码和JavaScript。

正如Olivia Bishop在视频中所说，85%的React原生代码库可以在平台之间共享。这些将是应用程序通常使用的组件和公共逻辑。

15%的代码是平台特定的。特定于平台的JavaScript赋予了平台特色(并使体验有所不同)。

最酷的事情是这个特定于平台的代码已经编写好了，所以您只需要使用它。