fork React 16.13.1 ,加上自己阅读源码的注释

Name		Name	Last commit message	Last commit date
Latest commit History 24 Commits
.circleci		.circleci
.codesandbox		.codesandbox
.github		.github
.idea		.idea
fixtures		fixtures
packages		packages
scripts		scripts
.editorconfig		.editorconfig
.eslintignore		.eslintignore
.eslintrc.js		.eslintrc.js
.gitattributes		.gitattributes
.gitignore		.gitignore
.mailmap		.mailmap
.nvmrc		.nvmrc
.prettierignore		.prettierignore
.prettierrc.js		.prettierrc.js
.watchmanconfig		.watchmanconfig
AUTHORS		AUTHORS
CHANGELOG.md		CHANGELOG.md
CODE_OF_CONDUCT.md		CODE_OF_CONDUCT.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
SECURITY.md		SECURITY.md
appveyor.yml		appveyor.yml
babel.config.js		babel.config.js
dangerfile.js		dangerfile.js
netlify.toml		netlify.toml
package.json		package.json
yarn.lock		yarn.lock

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