`exports` is simply a variable containing a reference to `module.exports`.
`module.exports` is an empty object to start, so you can start assigning
stuff to its properties right away.
So when you have `var app = exports`, you're using `app` as a reference to
the object assigned to `module.exports`, so any changes you make to that
will be exported.
When you have `var app = {}` and assign `exports = app`, you overwrite the
reference from `exports` to `module.exports` so `module.exports` never gets
modified. If you instead had `module.exports = app` then you would
successfully export whatever is in `app`.
In general, use `module.exports` and avoid `exports` altogether.
On Sunday, July 29, 2012 10:39:29 PM UTC-4, 软刀 wrote:
>
> # a.js :
>
> #! /usr/bin/env node
> // coding: utf-8
> // author: ruandao(ljy080...@gmail.com)
>
> var app = exports;
> app.yaha = 'jjj';
> app.yahajk = 'eklj';
> app.echo = function(){
> console.log(this.yaha);
> };
>
>
> and I run in node:
>
> > yan@cpu:~$ node
> > a=require('./a');
> { yaha: 'jjj',
> yahajk: 'eklj',
> echo: [Function] }
>
>
>
> but why , I never assignment *app* to *exports *, it should be undefined
> object!
> *
> *
>
> =======================================================================================================
>
> and again, when I wrote this:
> # a.js :
>
> #! /usr/bin/env node
> // coding: utf-8
> // author: ruandao(ljy080...@gmail.com)
>
> var app = {};
> app.yaha = 'jjj';
> app.yahajk = 'eklj';
> app.echo = function(){
> console.log(this.yaha);
> };
> exports = app;
>
>
> in node :
>
> > yan@cpu:~$ node
> > a=require('./a');
> {}
> > var c = {};
> undefined
> > c.yaha = 'jjj';
> 'jjj'
> > c
> { yaha: 'jjj' }
> >
>
> why app's peoperties: *yaha, yahajk *and it's method *echo *lose
>
>
> thanks very much!
>
>
>
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