Node.js Module exports 和module.exports之间的联系与区别

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最近大家都说两者是一样的，其实不然，本文来自

http://www.hacksparrow.com/node-js-exports-vs-module-exports.html翻译
相信大家都很熟悉exports的用法了，你可以创建一个function在你的模块中如下：
The exports object is created by the Modulesystem. Sometimes this is not acceptable, many want their module to be aninstance of some class. To do this assign the desired export object to module.exports. For example suppose we were making amodule called a.js<textarea readonly name="code" style="outline-style:none; outline-width:initial; outline-color:initial; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; word-break:break-all; word-wrap:break-word; color:rgb(51,51,51); font-family:Arial; font-size:14px; line-height:21px">Then in another file we could do<textarea readonly name="code" style="outline-style:none; outline-width:initial; outline-color:initial; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; word-break:break-all; word-wrap:break-word; color:rgb(51,51,51); font-family:Arial; font-size:14px; line-height:21px">Note that assignment to [font='Lucida Console']module.exports must be done immediately. It cannotbe done in any callbacks. This does not work:x.js:<textarea readonly name="code" style="outline-style:none; outline-width:initial; outline-color:initial; margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px; word-break:break-all; word-wrap:break-word; color:rgb(51,51,51); font-family:Arial; font-size:14px; line-height:21px">y.js:<textarea readonly name="code" class="javascript">var x = require('./x');console.log(x.a);