在Javascript / node.js中共享模块之间的变量？

I have 3 node files:

我有3个节点文件：

// run.js

require('./configurations/modules');
require('./configurations/application');

// modules.js

var express = module.exports.express = require('express');
var app = module.exports.app = express.createServer();

// app.js

app.configure(...)

Run.js requires both files, modules.js which require a module and creates a variable, and app.js which should use that variable. But I get an error on app.js cause app isn't defined.

Run.js需要两个文件，modules.js需要一个模块并创建一个变量，app.js应该使用该变量。但我在app.js上收到错误导致app未定义。

Is there a way to make this possible?

有没有办法让这成为可能？

2 个解决方案

#1

Everything declared in a module is local to that module unless it is exported.

除非导出模块，否则模块中声明的所有内容都是该模块的本地模块。

Exported objects from one module can be accessed from other modules that reference it.

可以从引用它的其他模块访问一个模块中的导出对象。

$ cat run.js 
require('./configurations/modules');
require('./configurations/application');

$ cat configurations/modules.js 
exports.somevariable = {
  someproperty: 'first property'
};

$ cat configurations/application.js 
var modules = require('./modules');

modules.somevariable.something = 'second property';
console.log(modules.somevariable);

$ node run.js 
{ someproperty: 'first property',
  something: 'second property' }

2 个解决方案

#1

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