方法一，如果有多个识别对象，在Update中循环识别对象数组，获取TrackableBehaviour组件
( item mTrackableBehaviour = item.GetComponent<Vuforia.TrackableBehaviour> (mTrackableBehaviour != && ()mTrackableBehaviour.CurrentStatus> (mTrackableBehaviour.transform.name == +
方法二，直接把代码挂在识别对象上，判断该对象是否被识别
mTrackableBehaviour = GetComponent<Vuforia.TrackableBehaviour> (mTrackableBehaviour != && ()mTrackableBehaviour.CurrentStatus> (mTrackableBehaviour.transform.name == +
识别对象状态枚举：
