Node.js提供了一个简单的模块系统，可以让node.js的文件可以相互调用。模块是node.js应用程序的基本组成部分，文件与模块一一对应。也就是说一个文件就是一个模块，这些文件可以是javascript、json或者编译过的c/c++文件。模块调用有一个模块hello.js: export...

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