The trigger name, used to associate it with an element. Unique within the component.
触发器名称,用于把它和元素关联起来。在组件内要唯一。
definitions
An animation definition object, containing an array of state and transition declarations.
一个动画定义对象,包含一组状态和转场声明。
options
An options object containing a delay and developer-defined parameters that provide styling defaults and can be overridden on invocation. Default delay is 0.