Is react JavaScript?

react is not JavaScript, but a library written in JavaScript language. It is a declarative, efficient and flexible JS library for building user interfaces; using react, you can combine some short, independent code snippets into a complex front-end UI interface.

The operating environment of this tutorial: windows7 system, javascript1.8.5&&react16 version, Dell G3 computer.

JavaScript is a high-level, interpreted programming language; it is a prototype-based, function-first language, and a multi-paradigm language that supports object-oriented programming, imperative programming, and Functional programming.

And React is a declarative, efficient and flexible JavaScript library for building user interfaces. Using React, you can combine some short, independent code snippets into complex UI interfaces. These code snippets are called "components".

Because the design idea of ​​React 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.

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.

For enterprises, react is the dividing line between junior Web front-end engineers and mid-to-senior front-end engineers. With the innovation of Internet technology and more and more people pouring into the front-end industry, the threshold for enterprise recruitment has increased. , and react can be regarded as the first network for selecting talents.

Advantages of using react

1. React is very fast

It does not directly operate on the DOM, but introduces a virtual DOM Concept, placed between JavaScript logic and the actual DOM, with good performance.

reactjs defines a set of dom models in the form of variables. All operations and conversions are directly in the variables. This reduces the need to operate the real dom. The performance is really high. It is essentially different from the mainstream MVC framework. It does not Dealing with dom.

2. Cross-browser compatibility

Virtual DOM helps us solve cross-browser problems. It provides us with a standardized API, which is no problem even in IE8.

3. Everything is component:

The code is more modular, it is easier to reuse the code, and the maintainability is high.

4. One-way data flow

In fact, the core content of reactjs is data binding. The so-called data binding means that as long as some server-side data is bound to the front-end page, developers Just focus on realizing the business

5. Isomorphic, pure javascript

Because the search engine crawler program relies on server-side response rather than JavaScript execution, pre-rendering your application has Helps with search engine optimization.

6. Good compatibility

For example, use RequireJS for loading and packaging, while Browserify and Webpack are suitable for building large applications. They make those difficult tasks less daunting.

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