Node.js 服务器端的JavaScript

 Node.js 是一个基于Chrome JavaScript 运行时建立的一个平台, 用来方便地搭建快速的 易于扩展的网络应用· Node.js 借助事件驱动, 非阻塞I/O 模型变得轻量和高效, 非常适合 运行在分布式设备 的 数据密集型 的实时应用

Node.js是一个可以快速构建网络服务及应用的平台 。该平台的构建是基于Chrome's JavaScript runtime,也就是说,实际上它是对Google V8引擎(应用于Google Chrome浏览器)进行了封装。
V8引擎执行Javascript的速度非常快,性能非常好。Node对一些特殊用例进行了优化,提供了替代的API,使得V8在非浏览器环境下运行得更好。
例如,在服务器环境中,处理二进制数据通常是必不可少的,但Javascript对此支持不足,因此,V8.Node增加了Buffer类,方便并且高效地处理二进制数据。因此,Node不仅仅简单地使用了V8,还对其进行了优化,使其在各环境下更加给力。

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