本系列文章以 react 最新的版本： 16.0.0-beta.5 为准。 首先我们入口文件 ReactEntry.js 来看，

var ReactBaseClasses = require("ReactBaseClasses")
var ReactChildren = require("ReactChildren")
var ReactElement = require("ReactElement")
var ReactVersion = require("ReactVersion")

var onlyChild = require("onlyChild")

依赖模块： • ReactBaseClasses • ReactChildren • ReactElement • onlyChild • ReactElementValidator 接着:

var createElement = ReactElement.createElement
var createFactory = ReactElement.createFactory
var cloneElement = ReactElement.cloneElement

if (__DEV__) {
  var ReactElementValidator = require("ReactElementValidator")
  createElement = ReactElementValidator.createElement
  createFactory = ReactElementValidator.createFactory
  cloneElement = ReactElementValidator.cloneElement
}

可以看到在开发环境下提供了对组件的验证。

var React = {
  Children: {
    map: ReactChildren.map,
    forEach: ReactChildren.forEach,
    count: ReactChildren.count,
    toArray: ReactChildren.toArray,
    only: onlyChild,
  },

  Component: ReactBaseClasses.Component,
  PureComponent: ReactBaseClasses.PureComponent,
  unstable_AsyncComponent: ReactBaseClasses.AsyncComponent,

  createElement: createElement,
  cloneElement: cloneElement,
  isValidElement: ReactElement.isValidElement,

  createFactory: createFactory,

  version: ReactVersion,

  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED: {
    ReactCurrentOwner: require("ReactCurrentOwner"),
  },
}

上面这些就是 React 提供的所有 API 了。 我会在后续的文章依次对这些 API 的实现进行解读。

相关文章#

• {% post_link react-source-code-analyze-1 React 源码浅析之 - 入口文件 %}
• {% post_link react-source-code-analyze-2 React 源码浅析之 - ReactBaseClasses %}
• {% post_link react-source-code-analyze-3 React 源码浅析之 - ReactChildren %}
• {% post_link react-source-code-analyze-4 React 源码浅析之 - ReactElement %}
• {% post_link react-source-code-analyze-5 React 源码浅析之 - onlyChildren %}