新闻 Vue 2.0.0-beta.1 发布，轻量级 JavaScript 框架 下载

Vue 2.0.0-beta.1 发布了，Vue.js 是构建 Web 界面的 JavaScript 库，提供数据驱动的组件，还有简单灵活的 API，使得 MVVM 更简单。

本次更新意味着API和功能集现在被认为是完整的，在官方2.0版本之前将尽最大努力避免进一步的重大更改。该团队将重点放在稳定、文件和更新支持库上，例如 vue-router 2.0。

注意：如果你是从之前的 2.0-alpha 版本升级或使用 vue-loader 、 vueify，确保完全重新安装NPM的依赖。

Fixed

• 
  #3176 fix v-for list update edge case
  
  
• 
  #3179 fix v-model on component value always casted to string
  
  
• 
  various other internal stability fixes
  

重要更新：

• 
  Custom directive change:
  
  
  • 
    update hook will now always be called when the component is updated. This makes the lifecycle more consistent with the new rendering model. The user can simply check forbinding.value !== binding.oldValue to persist the old behavior, or always perform the update (e.g. when the directive is bound to an object that might be mutated instead of replaced).
    
    
  • 
    hook naming change: postupdate -> componentUpdated.
    
• 
  Transition hooks naming change (now same with 1.x):
  
  
  • 
    onEnter -> enter
    
    
  • 
    onLeave -> leave
    
• 
  Server-side rendering:
  
  
  • 
    The component-level caching option server.getCacheKey is renamed to serverCacheKey(no longer necessary to nest under the server block):
    
    export default {
    // ...
    serverCacheKey: props => props.item.id
    }
  • 
    createRenderer and createBundleRenderer no longer uses lru-cache as the default cache implementation. The user is now responsible for providing the cache implementation which should adhere to the following interface:
    
    {
    get: (key: string, [cb: Function]) => string | void,
    set: (key: string, val: string) => void,
    has?: (key: string, [cb: Function]) => boolean | void // optional
    }
    
    更多细节，请看 docs for SSR caching.
    
• 
  Functional component render function signature change:
  
  The first argument is still h which is $createElement bound to the parent instance. Everything else is now passed in the second argument which is a context object:
  
  export default {
  functional: true,
  render (h, context) {
  // extracted and validated props for the functional component itself
  context.props
  
  // raw data for the functional component's vnode
  // without extracted props
  context.data
  
  // **a function** that returns the child elements
  // nested inside the functional component's tag
  context.children
  
  // the parent component instance
  context.parent
  }
  }
  
  This avoids having to remember the argument order and makes it easier when you only need some of the arguments:
  
  export default {
  functional: true,
  render (h, { data, children }) {
  // simple identity higher-order component
  return h(SomeOtherComponent, data, children)
  }
  }

下载地址：

• 
  Source code (zip)
  
  
• 
  Source code (tar.gz)
  

Vue 2.0.0-beta.1 发布，轻量级 JavaScript 框架下载地址