Ember.js 2.8.0-beta.2 和 v2.9.0-alpha.2 发布

Ember.js 2.8.0-beta.2 和 v2.9.0-alpha.2 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。

Ember.js 2.8.0-beta.2 更新内容：

#13887 [BUGFIX] Add assertions for illegal component invocations.
#13892 [CLEANUP] Remove View#createElement / View#destroyElement.
#13895 [BUGFIX] Fix template meta lookup for nested tagless and blockless components.
#13911 [BUGFIX] Avoid using clobbering .env property on components.
#13913 [BUGFIX] Disallow paths beginning with @ in templates.
#13920 [BUGFIX] Add more info to the Ember.Binding deprecation.

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Ember.js v2.9.0-alpha.2 主要更新内容，完整更新见 #13949。

#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 whenever anything 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 using Ember.set.
"Tagless" components (components with tagName set to an empty string) used to ignore anyid 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").

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