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/

反应

React is used for creating websites, web apps, SPAs etc. React is a Javascript library used for creating UI hierarchy. It is responsible for rendering of UI components, It is considered as V part Of MVC framework. React’s virtual DOM is faster than the conventional full refresh model, since the virtual DOM refreshes only parts of the page, Thus decreasing the page refresh time. React uses components as basic unit of UI which can be reused this saves coding time. Simple and easy to learn. React Native React Native is a framework that is used to create cross-platform Native apps. It means you can create native apps and the same app will run on Android and ios. React native have all the benefits of ReactJS React native allows developers to create native apps in web-style approach.

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。

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

首先是相似之处:React和React Native (RN)都是为了创建灵活的用户界面而设计的。这些框架有很多好处，但最基本的一点是它们是为ui开发而设计的。Facebook在React之后几年开发了RN。

反应: Facebook设计的这个框架几乎就像在HTML/XML中编写JavaScript，这就是为什么标签被称为“JSX”(JavaScript XML)，类似于我们熟悉的类似HTML的标签，如<div>或<p>。React的一个标志是大写字母标记，它表示自定义组件，例如<MyFancyNavbar />，它也存在于RN中。然而，React使用DOM。DOM是为HTML而存在的，因此React是用于web开发的。

React Native: RN does not use HTML, and therefore is not used for web development. It is used for... virtually everything else! Mobile development (both iOS & Android), smart-devices (e.g. watches, TVs), augmented reality, etc. As RN has no DOM to interact with, instead of using the same sort of HTML tags used in React, it uses its own tags which are then compiled into other languages. For example, instead of <div> tags, RN developers use RN's built-in <View> tag, which compiles into other native code under the hood (e.g. android.view on Android; and UIView on iOS).

简而言之:它们非常相似(对于UI开发)，但用于不同的媒介。

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。