Express

Express 是一个保持最小规模的灵活的 Node.js Web 应用程序开发框架，为 Web 和移动应用程序提供一组强大的功能。

基于Express的框架有以下

Feathers: Build prototypes in minutes and production ready real-time apps in days.

ItemsAPI: Search backend for web and mobile applications built on Express and Elasticsearch.

KeystoneJS: Website and API Application Framework / CMS with an auto-generated React.js Admin UI.

Kraken: Secure and scalable layer that extends Express by providing structure and convention.

LEAN-STACK: The Pure JavaScript Stack.

LoopBack: Highly-extensible, open-source Node.js framework for quickly creating dynamic end-to-end REST APIs.

MEAN: Opinionated fullstack JavaScript framework that simplifies and accelerates web application development.

Sails: MVC framework for Node.js for building practical, production-ready apps.

Bottr: Framework that simplifies building chatbot applications.

Hydra-Express: Hydra-Express is a light-weight library which facilitates building Node.js Microservices using ExpressJS.

Blueprint: a SOLID framework for building APIs and backend services

Locomotive: Powerful MVC web framework for Node.js from the maker of Passport.js

graphql-yoga: Fully-featured, yet simple and lightweight GraphQL server

Express Gateway: Fully-featured and extensible API Gateway using Express as foundation

Dinoloop: Rest API Application Framework powered by typescript with dependency injection

Kites: Template-based Web Application Framework

中文官网：http://www.expressjs.com.cn/

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安装node+express

1、apt-get预设node repository

sudo apt-get update
sudo apt-get install -y python-software-properties software-properties-common
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs 或者 sudo apt-get install nodejs-legacy

输入测试 node -v 或者nodejs -v

2、安装npm

sudo apt-get install npm

输入测试npm -v

3、国内可以安装cnpm

sudo npm install -g cnpm --registry=https://registry.npm.taobao.org

4、安装express框架

sudo npm install express -gd 或者 sudo cnpm install express -gd

-g代表安装到NODEPATH的lib里面，而-d代表把相依性套件也一起安装。

如果沒有-g的话会安装目前所在的目录(会建立一个nodemodules的文件夹)

sudo apt-get install express-generator （sudo apt-get install node-express-generator）

输入测试express --version

5、node升级

sudo npm install -g n #全局安装n模块，用于升级node

sudo n latest #安装官方最新版本
sudo n stable #安装官方稳定版本
sudo n lts #安装官方最新LTS版本

sudo npm install -g npm #更新npm

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Express项目建立

1、建立Express项目（example）

express example

2、启动项目

进入example目录，运行服务器：

npm start

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mongoose安装和使用

1、安装mongodb

sudo apt-get install mongodb

测试：输入mongo

默认数据存储 /var/lib/mongodb
默认log文件 /var/log/mongodb/mongodb.log
默认配置文件 /etc/mongodb.conf

关闭，开启，重启mongodb服务

sudo mongodb service stop
sudo mongodb service start
sudo mongodb service restart

配置文件路径：

sudo vi /etc/mongodb.conf
dbpath是数据存放的地址修改为你想存放的路径
logpath是日志存放的地址

修改配置后需要重启

sudo mongodb service restart

2、安装mongoose

sudo npm install mongoose

3、例子代码

建立数据库连接mongo.js文件

var Mongoose = require("mongoose");    //
Mongoose.Promise = global.Promise;
var db Mongoose.createConnection('mongodb://localhost:27017/test');

//链接错误
db.on('error', function(error) {
   console.log(error);
});

//链接成功
db.once('open',function(){
     console.log('Mongoose connection opened');
});

//链接关闭
db.on('disconnected', function () { 
   console.log('Mongoose connection disconnected');
});
  
module.exports = db;

建立表文件user.js文件

var Mongoose = require('mongoose');
var mongo = require('./mongo');
var ObjectId = Mongoose.Schema.ObjectId;

//=============================================
//用户记录

var UserSchema = new Mongoose.Schema({
  uid : {type : Number},   //序号
  type : {type : Number, default:0}, 
  name : {type : String},
  birthday   : {type : Date}, //
  status : {type : Number, default:1}
},{
  versionKey: false, //版本
  timestamps: true  //时间戳createdAt、updatedAt
});

UserSchema.index({'uid':1}); //建立uid索引，正序
UserSchema.index({'name':1}); //建立name索引，正序
var UserModel = mongo.model('users', UserSchema);

module.exports = UserModel;

mongoose API资料：

https://mongoosejs.com/docs/api.html

3、mongo升级

未完待续