如何决定何时使用Node.js？

问题：

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I am new to this kind of stuff, but lately I've been hearing a lot about how good Node.js is. 我对这种东西是陌生的，但是最近我已经听到很多关于Node.js有多出色的信息。 Considering how much I love working with jQuery and JavaScript in general, I can't help but wonder how to decide when to use Node.js. 考虑到我一般喜欢使用jQuery和JavaScript有多少，我不禁想知道如何决定何时使用Node.js。 The web application I have in mind is something like Bitly - takes some content, archives it. 我想到的Web应用程序有点像Bitly-需要一些内容，然后将其存档。

From all the homework I have been doing in the last few days, I obtained the following information. 从过去几天我所做的所有作业中，我获得了以下信息。 Node.js Node.js

is a command-line tool that can be run as a regular web server and lets one run JavaScript programs 是一种命令行工具，可以作为常规Web服务器运行，并且可以运行一个JavaScript程序
utilizes the great V8 JavaScript engine 利用强大的V8 JavaScript引擎
is very good when you need to do several things at the same time 需要同时做几件事时非常好
is event-based so all the wonderful Ajax -like stuff can be done on the server side 是基于事件的，因此所有出色的类似于Ajax的工作都可以在服务器端完成
lets us share code between the browser and the backend 让我们在浏览器和后端之间共享代码
lets us talk with MySQL 让我们与MySQL对话

Some of the sources that I have come across are: 我遇到的一些来源是：

Diving into Node.js – Introduction and Installation 深入Node.js –简介和安装
Understanding NodeJS 了解NodeJS
Node by Example ( Archive.is ) 示例节点（ Archive.is ）
Let's Make a Web App: NodePad 让我们制作一个Web应用程序：NodePad

Considering that Node.js can be run almost out-of-the-box on Amazon's EC2 instances, I am trying to understand what type of problems require Node.js as opposed to any of the mighty kings out there like PHP , Python and Ruby . 考虑到Node.js几乎可以直接在亚马逊的EC2实例上运行，我试图了解Node.js需要哪种类型的问题，而不是像PHP ， Python和Ruby这样的强大之王。 I understand that it really depends on the expertise one has on a language, but my question falls more into the general category of: When to use a particular framework and what type of problems is it particularly suited for? 我知道这确实取决于一个人在某种语言上的专业知识，但是我的问题更多地归结为以下一般类别：什么时候使用特定框架，它特别适合什么类型的问题？