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/

React本质上是Facebook自己开发的。它实际上是在2013年进入科技界的。React是一个JS库，不是一个框架。React最值得注意的一点是它能够创建前端和后端。

React NATIVE只是一个移动开发平台。在使用React native之前，你需要知道Android的Java或iPhone和iPad的Objective-C来创建原生React应用程序。简单地说，React是Webdev技术，React- native是移动开发技术。

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/

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

React Native是一个JavaScript框架，它提供了编写多平台应用程序(如iOS或Android)所需的一切。

ReactJS是一个JavaScript库，用于构建web界面和构建您的网站。

React-Native是一个用于开发Android和iOS应用程序的框架，它共享80% - 90%的Javascript代码。

而React.js是用于开发web应用程序的父Javascript库。

当你在React-Native中使用像<View>， <Text>这样的标签时，React.js使用像<div> <h1> <h2>这样的web html标签，这只是web/移动开发词典中的同义词。 对于React.js，你需要DOM来渲染html标签的路径，而对于移动应用程序:React-Native使用AppRegistry来注册你的应用程序。

我希望这是一个简单的解释React.js和React-Native的快速差异/相似之处。