If you had even learned anything about ng-animate directive brought by AngularJS 1.1, then just forget it. AngularJS 1.2 has brand new implementation for ngAnimate.
如果你了解过AngularJS 1.*是如何做到动画的，那么请忘了吧，因为整个动画机制已经修改了。
For more, click here.
了解更多信息，点击这里. (英文)
详细实例：
See the Pen AngularJS 1.2 ngAnimate Instance by Paul Lan by Paul Lan (@lanshunfang) on CodePen