React v0.12发布.构建用户界面的JavaScript 库

　　React v0.12 发布，此版本引入了新术语；修改了 APIs，使得 React 一些概念更简洁。 同时还对 JSX 做了一些修改，飞起了一些函数。 

　　此版本现已提供下载：

• React
  Dev build with warnings: http://fb.me/react-0.12.0.js
  Minified build for production: http://fb.me/react-0.12.0.min.js
  

• React with Add-Ons
  Dev build with warnings: http://fb.me/react-with-addons-0.12.0.js
  Minified build for production: http://fb.me/react-with-addons-0.12.0.min.js
  

• In-Browser JSX transformer
  http://fb.me/JSXTransformer-0.12.0.js

React 团队通过发布了 react 和 react-tools  0.12.0 包到 npm 和 react 包到 bower。

更多内容请看这里。

Changelog

React Core

重大改进 

• key and ref moved off props object, now accessible on the element directly

• React is now BSD licensed with accompanying Patents grant

• Default prop resolution has moved to Element creation time instead of mount time, making them effectively static

• React.__internals is removed - it was exposed for DevTools which no longer needs access

• Composite Component functions can no longer be called directly - they must be wrapped with React.createFactory first. This is handled for you when using JSX.

新特性

• Spread operator ({...}) introduced to deprecate this.transferPropsTo

• Added support for more HTML attributes: acceptCharset, classID, manifest

废弃

• React.renderComponent --> React.render

• React.renderComponentToString --> React.renderToString

• React.renderComponentToStaticMarkup --> React.renderToStaticMarkup

• React.isValidComponent --> React.isValidElement

• React.PropTypes.component --> React.PropTypes.element

• React.PropTypes.renderable --> React.PropTypes.node

• DEPRECATED React.isValidClass

• DEPRECATED instance.transferPropsTo

• DEPRECATED Returning false from event handlers to preventDefault

• DEPRECATED Convenience Constructor usage as function, instead wrap withReact.createFactory

• DEPRECATED use of key={null} to assign implicit keys

Bug 修复

• Better handling of events and updates in nested results, fixing value restoration in "layered" controlled components

• Correctly treat event.getModifierState as case sensitive

• Improved normalization of event.charCode

• Better error stacks when involving autobound methods

• Removed DevTools message when the DevTools are installed

• Correctly detect required language features across browsers

• Fixed support for some HTML attributes:

• list updates correctly now

• scrollLeft, scrollTop removed, these should not be specified as props

• Improved error messages

React With Addons

新特性

• React.addons.batchedUpdates added to API for hooking into update cycle

重大改进

• React.addons.update uses assign instead of copyProperties which doeshasOwnProperty checks. Properties on prototypes will no longer be updated correctly.

Bug 修复

• Fixed some issues with CSS Transitions

JSX

重大改进

• Enforced convention: lower case tag names are always treated as HTML tags, upper case tag names are always treated as composite components

• JSX no longer transforms to simple function calls

新特性

• @jsx React.DOM no longer required

• spread ({...}) operator introduced to allow easier use of props

Bug 修复

• JSXTransformer: Make sourcemaps an option when using APIs directly (eg, for react-rails)

React.js 是 Facebook 推出的一个用来构建用户界面的 JavaScript 库。

Facebook开源了React，这是该公司用于构建反应式图形界面的JavaScript库，已经应用于构建Instagram网站及 Facebook部分网站。最近出现了AngularJS、MeteorJS 和Polymer中实现的Model-Driven Views等框架，React也顺应了这种趋势。React基于在数据模型之上声明式指定用户界面的理念，用户界面会自动与底层数据保持同步。与前面提及 的框架不同，出于灵活性考虑，React使用JavaScript来构建用户界面，没有选择HTML。