文件：服务器：包含api代码。 bookapi.js：使用restify，mongojs，restify-memory-session
client: contains web app code.
index.html:
the spa for book web app.
static:
the static resources, images, scripts, css.
test: contains test code.
api.js:
use the http to mock some client request to the server.
开始：之前：＃brew install mongodb＃brew install节点＃sudo mongod服务器：＃cd服务器＃npm install mongojs，restify，restify-memory-se
