版本:2.0.0-alpha.25
- https://cdn.bootcdn.net/ajax/libs/angular./2.0.0-alpha.25/angular2.dev.
- https://cdn.bootcdn.net/ajax/libs/angular./2.0.0-alpha.25/angular2.
- https://cdn.bootcdn.net/ajax/libs/angular./2.0.0-alpha.25/angular2.min.
- https://cdn.bootcdn.net/ajax/libs/angular./2.0.0-alpha.25/angular2.sfx.dev.