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The priority of the native module is second only to that of the file module cache. After parsing the file name, the require method first checks whether the module is in the list of native modules. Take the HTTP module as an example. Although there is a,,,, file in the directory, it will not be loaded from these files, but from the native module. ?方威跟板栗越来越投契，几乎无话不谈。军器坊没了自己还叫什么军器坊，眼下可托之人唯有戚继光，外加此行东瀛，须沈悯芮同往，总该告知一下。金的便利是有趣的，发自内心的故事金，一个韩裔加拿大家庭，经营一家便利店在多伦多市中心。白凡忽然笑道：你这想法新奇。D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program: