总结:React.js用于Web开发，而React-Native用于移动应用程序开发

REACT是一个Javascript库，用于构建像Facebook这样的大型/小型界面web应用程序。

REACT NATIVE是一个Javascript框架，用于开发Android、IOS和Windows Phone上的原生移动应用程序。

两者都是由Facebook开源的。

React和React-native之间的主要区别是React带有基于Web的UI组件，而React native则带有与移动相关的UI小部件，其余一切几乎相似。

简单来说 ReactJS是父库，它返回一些东西来渲染每个主机环境(浏览器，移动，服务器，桌面等)。 除了渲染，它还提供了其他方法，如生命周期钩子..等。

在浏览器中，它使用另一个库react-dom来呈现DOM元素。 在移动端，它使用React-Native组件来呈现特定平台(IOS和Android)的本地UI组件。 所以,

React + React -dom = web开发

React + React -native =移动开发

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/

以下是我所知道的不同之处:

它们有不同的html标签:React Native用于处理文本，而不是在React中。 React Native使用可触摸组件代替常规按钮 元素。 React Native有ScrollView和FlatList组件用于呈现列表。 React Native使用AsyncStorage，而React使用本地存储。 在React中，原生路由器的功能是堆栈，而在React中，我们使用Route组件进行映射导航。