与轮询相对应的另外一种检测方式-多线程（multi-thread），本程序中，除了主线程以外，原来的应用程序还有线程在执行，形成了应用程学的多线程模式。-Polling corresponding with another test- multi-threaded (multi-thread), this procedure, apart from the main thread, the original application also in the implementation of th