react is open source, to be precise, it was open sourced in May 2013; React is a JavaScript library used to build user interfaces, mainly used to build UI; you can pass multiple types of parameters in React , such as declaring code to help you render UI, it can also be a static HTML DOM element, or it can pass dynamic variables, or even interactive application components.
The operating environment of this tutorial: Windows 10 system, react18.0.0 version, Dell G3 computer.
Is react open source?
Open source.
React is a JavaScript library used to build user interfaces. It originated from Facebook's internal project. The company was not satisfied with all the JavaScript MVC frameworks on the market and decided to develop its own one to build Instagram. website. Open sourced in May 2013.
Generation background
Because React’s design idea is extremely unique, it is a revolutionary innovation, has outstanding performance, and the code logic is very simple. Therefore, more and more people are beginning to pay attention to and use it, thinking that it may be the mainstream tool for web development in the future.
The project itself is getting bigger and bigger, from the earliest UI engine to a complete set of front-end and back-end Web App solutions. The derived React Native project has even more ambitious goals. It hopes to write Native App in the same way as Web App. If it can be realized, the entire Internet industry will be subverted, because the same group of people only need to write the UI once and it can run on the server, browser and mobile phone at the same time.
Framework usage
React is mainly used to build UI. You can pass various types of parameters in React, such as declaration codes to help you render UI, static HTML DOM elements, dynamic variables, and even interactive application components.
Framework Features
1. Declarative design: React makes creating interactive UI a breeze. Design concise views for each state of your application, and React can efficiently update and render the appropriate components when data changes.
2. Componentization: Build encapsulated components that manage their own state, and then combine them to form complex UI.
3. Efficiency: React minimizes interaction with the DOM by simulating the DOM.
4. Flexibility: No matter what technology stack you are using now, you can develop new features by introducing React without rewriting existing code.
Recommended learning: "react video tutorial"
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在react中,canvas用于绘制各种图表、动画等;可以利用“react-konva”插件使用canvas,该插件是一个canvas第三方库,用于使用React操作canvas绘制复杂的画布图形,并提供了元素的事件机制和拖放操作的支持。

在react中,antd是基于Ant Design的React UI组件库,主要用于研发企业级中后台产品;dva是一个基于redux和“redux-saga”的数据流方案,内置了“react-router”和fetch,可理解为应用框架。

React不是双向数据流,而是单向数据流。单向数据流是指数据在某个节点被改动后,只会影响一个方向上的其他节点;React中的表现就是数据主要通过props从父节点传递到子节点,若父级的某个props改变了,React会重渲染所有子节点。

因为在react中需要利用到webpack,而webpack依赖nodejs;webpack是一个模块打包机,在执行打包压缩的时候是依赖nodejs的,没有nodejs就不能使用webpack,所以react需要使用nodejs。

react是组件化开发;组件化是React的核心思想,可以开发出一个个独立可复用的小组件来构造应用,任何的应用都会被抽象成一颗组件树,组件化开发也就是将一个页面拆分成一个个小的功能模块,每个功能完成自己这部分独立功能。

react和reactdom的区别是:ReactDom只做和浏览器或DOM相关的操作,例如“ReactDOM.findDOMNode()”操作;而react负责除浏览器和DOM以外的相关操作,ReactDom是React的一部分。

在react中,forceupdate()用于强制使组件跳过shouldComponentUpdate(),直接调用render(),可以触发组件的正常生命周期方法,语法为“component.forceUpdate(callback)”。

react与vue的虚拟dom没有区别;react和vue的虚拟dom都是用js对象来模拟真实DOM,用虚拟DOM的diff来最小化更新真实DOM,可以减小不必要的性能损耗,按颗粒度分为不同的类型比较同层级dom节点,进行增、删、移的操作。


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