vuforia增强现实方面的内容，是关于识别图以及模型的动态加载代码-Vuforia to enhance the practical aspects of the content, is about the identification map and model of dynamic loading code

Vuforia对焦，调用Vuforia对焦方法，实现自动对焦效果(Vuforia focuses and calls the Vuforia focusing method to achieve auto focusing effect.)