Vue.js 1.0.0 beta4 发布，首个 RC 版本计划在下周发布，十月底发布正式版。
相比 1.0.0-beta.3，改进如下：
重大改进
Vue no longer extends Object.prototype with $set and $delete methods.
Instance method vm.$addChild() has been deprecated.
The global config proto has been deprecated.
v-for no longer uses track-by="$index" behavior for Arrays of primitive values by default.
v-for no longer converts the value to Array before piping it through filters.
The orderBy filter now expects its second argument to be a number instead of a boolean.
Global asset registration methods, e.g. Vue.component, now returns the registered asset.
改进
v-on can now handle multiple key modifiers:
Directive modifiers are now exposed to custom directive instances as this.modifiers:
Bug 修复
#1398 Use more reliable visibility check for transitions. This fixes situations where elements are stuck on leave if the parent element is not visible.
#1399 Modifiers are no longer included in this.arg for custom directives.
#1400 only warn twoWay prop binding type mismatch when the prop is present.
下载：https://github.com/yyx990803/vue/archive/1.0.0-beta.4.zip。
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。
主要特性：
可扩展的数据绑定
将普通的 JS 对象作为 model
简洁明了的 API
组件化 UI 构建
配合别的库使用
支持的浏览器：https://saucelabs.com/u/vuejs
来自:开源中国社区
