接下来的一段时间内我将带大家，阅读React 相关主要源码，让大家知其然，更要知其所以然。更好的利用React 进行项目开发
1、首先我们把github 上的react 包下载下来
github 地址：https://github.com/facebook/react
git clone https://github.com/facebook/react.git
2、然后找到 入口：packages / react / src / index.js，进行分析
'use strict';
const React = require('./src/React');
// TODO: decide on the top-level export form.// This is hacky but makes it work with both Rollup and Jest.
module.exports = React.default || React;
从这里我们可以得知，src/中的Reac.js 才是真正的入口,其包含的对象如下
const React = {
Children: {
map,
forEach,
count,
toArray,
only,
},
createRef,
Component,
PureComponent,
createContext,
forwardRef,
lazy,
memo,
useCallback,
useContext,
useEffect,
useImperativeHandle,
useDebugValue,
useLayoutEffect,
useMemo,
useReducer,
useRef,
useState,
Fragment: REACT_FRAGMENT_TYPE,
StrictMode: REACT_STRICT_MODE_TYPE,
Suspense: REACT_SUSPENSE_TYPE,
createElement: __DEV__ ? createElementWithValidation : createElement,
cloneElement: __DEV__ ? cloneElementWithValidation : cloneElement,
createFactory: __DEV__ ? createFactoryWithValidation : createFactory,
isValidElement: isValidElement,
version: ReactVersion,
unstable_ConcurrentMode: REACT_CONCURRENT_MODE_TYPE,
unstable_Profiler: REACT_PROFILER_TYPE,
__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: ReactSharedInternals,
};
下一节，我将就我们最常用到的Component ，和PureComponent 进行深入解析
