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node.js中require的问题

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node.js中require的问题

举个例子：在一个项目的主程序server.js中引入mongoose模块，又在另一个文件use.js中给mongoose定义格式和自定义方法，最后在sever.js引入这个文件，可在use.js为什么又要引入mongoose模块，主程序server.js中不是以及经引入了么？
求大佬告知
，


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use模块只是被server引用了，但是use中需要mongoose，是没有定义的，还是需要引入。
http://www.infoq.com/cn/articles/nodejs-module-mechanism


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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