What is it

A JavaScript library for building user interfaces

Ii. Developers

Developed by Facebook and open source

Three, why to learn

  1. Native JavaScript manipulation of the DOM is cumbersome and inefficient (DOM-API manipulation of UI).
  2. Using JavaScript to manipulate the DOM directly, the browser does a lot of redrawing and rearranging.
  3. Native JavaScript has no componentized coding scheme and low code reuse rate.

4. React

  1. Componentized mode and declarative coding are adopted to improve development efficiency and component reuse rate.
  2. React Native allows you to use the React syntax for mobile development.
  3. Use virtual DOM+ excellent Diffing algorithm to minimize interaction with real DOM.

An 🌰 :

  • Native JavaScript data changes manipulate the real DOM, and data updates are completely redrawn

  • The React virtual DOM will compare and render only the parts that are different

Learn the basics of JavaScript before React

  • Judge the direction of this
  • Class (class)
  • ES6 syntax specification
  • NPM package manager
  • Prototype, prototype chain
  • Common methods for arrays
  • modular