版本：2.0.0-alpha.3
- https://cdn.bootcdn.net/ajax/libs/vue/2.0.0-alpha.3/vue.common.js
- https://cdn.bootcdn.net/ajax/libs/vue/2.0.0-alpha.3/vue.common.min.js
- https://cdn.bootcdn.net/ajax/libs/vue/2.0.0-alpha.3/vue.js
- https://cdn.bootcdn.net/ajax/libs/vue/2.0.0-alpha.3/vue.min.js