var io = require('../..')(server)的作用是什么? [英] what does var io = require('../..')(server) do?

问题描述

我已经构建了项目 https://github.com/Automattic/socket.io/tree/master/examples/chat 在本地运行，效果很好.但是，最好能多了解一些套接字应用程序的工作原理.

I've build the project https://github.com/Automattic/socket.io/tree/master/examples/chat locally and it is working great. However, it would be nice to understand a little more about how a socket application works.

在主启动脚本中，需要插入的模块之一是

In the main startup script one of the modules that is pulled in with require is

var io = require('../..')(server)

require('../..')需要做什么?

what does require('../..') do?

谢谢！

推荐答案

将目录路径提供给require时，它将隐式在该目录中查找index.js.

When a path to a directory is given to require, it will implicitly look for an index.js in that directory.

在这种情况下，等同于

var socket = require("../../index.js");
var io     = socket(server);

在提供的示例中，他们只是使用一些速记并丢弃了对require的调用返回的中间值.

In the example provided, they're just using some shorthand and throw away the intermediate value returned by the call to require.

查看 module.require文档以获得更多信息.

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