这里有一个很好的解释:

Reactjs是一个同时支持前端和服务器的JavaScript库。此外，它还可以用于为移动应用程序和网站创建用户界面。

React Native是一个跨平台的移动框架，使用Reactjs来构建应用程序和网站。React Native编译成本地应用程序组件，使程序员能够用JavaScript构建可以在不同平台(如Windows、Android、iOS)上运行的移动应用程序。

Reactjs can be described as a base derivative of React DOM, for the web platform while React Native is a base derivative in itself, which means that the syntax and workflow remain the same, but components alter. Reactjs, eventually, is a JavaScript library, which enables the programmer to create an engaging and high performing UI Layer while React Native is an entire framework for building cross-platform apps, be it web, iOS or Android. In Reactjs, virtual DOM is used to render browser code in Reactjs while in React Native, native APIs are used to render components in mobile. The apps developed with Reactjs renders HTML in UI while React Native uses JSX for rendering UI, which is nothing but javascript. CSS is used for creating styling in Reactjs while a stylesheet is used for styling in React Native. In Reactjs, the animation is possible, using CSS, just like web development while in React Native, an animated API is used for inducing animation across different components of the React Native application. If the need is to build a high performing, dynamic, and responsive UI for web interfaces, then Reactjs is the best option while if the need is to give mobile apps a truly native feeling, then React Native is the best option.

更多信息请点击:https://www.simform.com/reactjs-vs-reactnative/

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/

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

React用于在浏览器中工作的web应用程序。 React Native用于android和IOS应用程序，这些应用程序在移动应用程序中工作。

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。

React Native是为移动应用程序，而React是为网站(前端)。这两个框架都是Facebook发明的。React Native是一个跨平台的开发框架，这意味着你可以为IOS和Android编写几乎相同的代码，而且它可以工作。我个人对React Native了解更多，所以我就到此为止。