npm install express -g
npm install express-generator -g

cd /Users/SPRINT/Desktop 进入桌面
express 项目名称

install dependencies:
 $ cd APIServer && npm install //告诉我们进入项目根目录 执行npm install安装依赖模块

run the app:
 $ DEBUG=APIServer:* npm start //告诉我们启动服务器

npm start //启动服务器

 var express = require('express');
 var path = require('path');
 var favicon = require('serve-favicon');
 var logger = require('morgan');
 var cookieParser = require('cookie-parser');
 var bodyParser = require('body-parser');

 var app = express();


///=======路由信息 （接口地址）开始 存放在./routes目录下===========//
 var routes = require('./routes/index');//home page接口
 var users = require('./routes/users'); //用户接口

 app.use('/', routes); //在app中注册routes该接口 
 app.use('/users', users);//在app中注册users接口
///=======路由信息 （接口地址 介绍===========//



///=======模板 开始===========//
// view engine setup
 app.set('views', path.join(__dirname, 'views'));
 app.set('view engine', 'jade');
///=======模板 结束===========//

var express = require('express');
var router = express.Router();


//定义一个get请求 path为根目录
/* GET home page. */
router.get('/', function(req, res, next) {
 res.render('index', { title: 'Express' });
});

module.exports = router;

app.METHOD(PATH, HANDLER)

function User() {
  this.name;
  this.city;
  this.age;
}
module.exports = User;

 var URL = require('url');

router.get('/getUserInfo', function(req, res, next) {

 var user = new User();
 var params = URL.parse(req.url, true).query;

 if(params.id == '1') {

 user.name = "ligh";
 user.age = "1";
 user.city = "北京市";

}else{ 
 user.name = "SPTING";
 user.age = "1";
 user.city = "杭州市";
}

 var response = {status:1,data:user};
 res.send(JSON.stringify(response));

});

var params = URL.parse(req.url, true).query;