源码阅读准备工作

1.看react官方仓库 (opens new window)README.md

Contributing Guide

Read our contributing guide (opens new window) to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React.

步骤如下：

• 下载源码：git clone https://github.com/facebook/react.git
• 安装依赖：yarn (贡献指南中使用yarn, 我们也使用这个)
• 查看package.json文件中的script, 可以看到大量的脚本命令
• 尝试: yarn build，发现报错，需要java环境

安装环境，过程中安装了jdk8，报错：java.lang.UnsupportedClassVersionError

相关信息：java.lang.UnsupportedClassVersionError: com/google/javascript/jscomp/CommandLineRunner has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java

关键信息class file version 55.0： java 版本需要jdk11，卸载重装jdk11

to be continue ...

官方推荐步骤：

cd ~/path_to_your_react_clone/
yarn build react/index,react/jsx,react-dom/index,scheduler --type=NODE

cd build/node_modules/react
yarn link
cd build/node_modules/react-dom
yarn link

cd ~/path/to/your/project
yarn link react react-dom