Node.js是一套用来编写高性能网络服务器Javas cript工具包。比较独特的是，Node.js会假设是在POSIX环境下运行它Linux或Mac OS X。如果是在Windows下，那就需要安装MinGW以获得一个仿POSIX的环境

是一个Javas cript运行环境。实际上它是对GoogleV8引擎（应用于Google Chrome浏览器)进行了封装。

Node.js? is a platform built on Chrome`s Javas cript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.