ReactJs简介 配置文件 执行os comandos: yarn add @babel/core @babel/preset-env @babel/preset-react webpack webpack-cli -D yarn add babel-loader -D yarn add webpack-dev-server -D yarn add react react-dom 准PropTypes yarn add prop-types Crie os arquivos: public / index.html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-