本书首先简要介绍 Node.js， 然后通过各种示例讲解 Node.js 的基本特性， 再用案例式教学的方式讲述如何用 Node.js 进行 Web 开发(his book first introduces Node.js briefly, then explains the basic characteristics of Node.js through various examples, and then describes how to develop Web with Node.js through case based teaching.)