Ember.js v2.9.0-alpha.3 发布 JavaScript 框架

Ember.js v2.9.0-alpha.3 发布了，Ember是一个雄心勃勃的Web应用程序，消除了样板，并提供了一个标准的应用程序架构的JavaScript框架。

该版本主要改进：

#13946: Re-rendering a component manually (i.e. calling this.rerender()) no longer forces everything in its subtree to recompute. Notably, helpers like {{unbound}} are not updated when re-rendering.
#13947: The willRender lifecycle hook will be called on a component wheneveranything in its subtree has changed.
#13948: “Backtracking re-render” is now an error in development mode, and will not work in production builds.
{{#each-in}} updates automatically when values are added to the object usingEmber.set.
“Tagless” components (components with tagName set to an empty string) used to ignore any id attribute, which unintentionally allowed users to repurpose it for their own uses. This is now a hard error (“You cannot use elementId on a tag-less component”).