新闻 React 16.3.0 发布，构建用户界面的 JavaScript 库 下载

React 16.3.0 已发布，React 是 Facebook 推出的一个为数据提供渲染为 HTML 视图，用来构建用户界面的开源 JavaScript 库。

React 视图通常采用包含以自定义 HTML 标记规定的其他组件的组件渲染。React 为程序员提供了一种子组件不能直接影响外层组件（"data flows down"）的模型，数据改变时对 HTML 文档的有效更新，和现代单页应用中组件之间干净的分离。

更新内容：

React

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  Add a new officially supported context API
  
  
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  Add a new React.createRef() API as an ergonomic alternative to callback refs.
  
  
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  Add a new React.forwardRef() API to let components forward their refs to a child.
  
  
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  Fix a false positive warning in IE11 when using React.Fragment
  
  
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  Replace React.unstable_AsyncComponent with React.unstable_AsyncMode
  
  
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  Improve the error message when calling setState() on an unmounted component.
  

React DOM

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  Add a new getDerivedStateFromProps() lifecycle and UNSAFE_ aliases for the legacy lifecycles.
  
  
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  Add a new getSnapshotBeforeUpdate() lifecycle
  
  
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  Add a new <React.StrictMode> wrapper to help prepare apps for async rendering.
  
  
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  Add support for onLoad and onError events on the <link> tag
  
  
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  Add support for noModule boolean attribute on the <script> tag
  
  
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  Fix minor DOM input bugs in IE and Safari
  
  
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  Correctly detect Ctrl + Enter in onKeyPress in more browsers
  
  
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  Fix containing elements getting focused on SSR markup mismatch
  
  
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  Fix value and defaultValue to ignore Symbol values
  
  
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  Fix refs to class components not getting cleaned up when the attribute is removed.
  
  
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  Throw with a meaningful message if the component runs after jsdom has been destroyed.
  
  
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  Don't crash if there is a global variable called opera with a null value
  
  
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  Don't check for old versions of Opera
  
  
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  Deduplicate warning messages about <option selected>
  
  
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  Deduplicate warning messages about invalid callback
  
  
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  Deprecate ReactDOM.unstable_createPortal() in favor of ReactDOM.createPortal().
  
  
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  Don't emit User Timing entries for context types
  
  
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  Improve the error message when context consumer child isn't a function.
  
  
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  Improve the error message when adding a ref to a functional component.
  

React DOM Server

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  Prevent an infinite loop when attempting to render portals with SSR.
  
  
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  Warn if a class doesn't extend React.Component.
  
  
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  Fix an issue with this.state of different components getting mixed up.
  
  
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  Provide a better message when component type is undefined.
  

React Test Renderer

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  Fix handling of fragments in toTree().
  
  
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  Shallow renderer should assign state to null for components that don't set it.
  
  
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  Shallow renderer should filter legacy context according to contextTypes.
  
  
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  Add an unstable API for testing asynchronous rendering.
  

React Is (New)

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  First release of the new package that libraries can use to detect different React node types.
  
  
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  Add ReactIs.isValidElementType() to help higher-order components validate their inputs.
  

React Lifecycles Compat (New)

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  First release of the new package to help library developers target multiple versions of React.
  

Create Subscription (New)

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  First release of the new package to subscribe to external data sources safely for async rendering.
  

React Reconciler (Experimental)

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  Expose react-reconciler/persistent for building renderers that use persistent data structures.
  
  
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  Pass host context to finalizeInitialChildren().
  
  
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  Remove useSyncScheduling from the host config.
  

React Call Return (Experimental)

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  Fix a crash on updates.
  

下载地址：https://github.com/facebook/react/releases/tag/v16.3.0
React 16.3.0 发布，构建用户界面的 JavaScript 库下载地址